255400505 has 8 divisors (see below), whose sum is σ = 307392072. Its totient is φ = 203712768.

The previous prime is 255400499. The next prime is 255400507. The reversal of 255400505 is 505004552.

It can be written as a sum of positive squares in 4 ways, for example, as 9193024 + 246207481 = 3032^2 + 15691^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255400505 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255400507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74102 + ... + 77471.

It is an arithmetic number, because the mean of its divisors is an integer number (38424009).

Almost surely, 2^255400505 is an apocalyptic number.

It is an amenable number.

255400505 is a deficient number, since it is larger than the sum of its proper divisors (51991567).

255400505 is a wasteful number, since it uses less digits than its factorization.

255400505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151915.

The product of its (nonzero) digits is 5000, while the sum is 26.

The square root of 255400505 is about 15981.2548005468. The cubic root of 255400505 is about 634.4643880770.

The spelling of 255400505 in words is "two hundred fifty-five million, four hundred thousand, five hundred five".