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390000557 = 1075336269
BaseRepresentation
bin10111001111101…
…110111110101101
31000011212002012002
4113033232332231
51244320004212
6102411022045
712443643602
oct2717567655
91004762162
10390000557
11190166211
12aa73a925
1362a5007b
1439b206a9
152438aac2
hex173eefad

390000557 has 4 divisors (see below), whose sum is σ = 390047580. Its totient is φ = 389953536.

The previous prime is 390000551. The next prime is 390000571. The reversal of 390000557 is 755000093.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 376903396 + 13097161 = 19414^2 + 3619^2 .

It is a cyclic number.

It is not a de Polignac number, because 390000557 - 214 = 389984173 is a prime.

It is a pancake number, because a pancake can be divided into 390000557 parts by 27928 straight cuts.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390000551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7382 + ... + 28887.

It is an arithmetic number, because the mean of its divisors is an integer number (97511895).

Almost surely, 2390000557 is an apocalyptic number.

It is an amenable number.

390000557 is a deficient number, since it is larger than the sum of its proper divisors (47023).

390000557 is a wasteful number, since it uses less digits than its factorization.

390000557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47022.

The product of its (nonzero) digits is 4725, while the sum is 29.

The square root of 390000557 is about 19748.4317605222. The cubic root of 390000557 is about 730.6147052285.

The spelling of 390000557 in words is "three hundred ninety million, five hundred fifty-seven", and thus it is an aban number.

Divisors: 1 10753 36269 390000557