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290387 = 535479
BaseRepresentation
bin1000110111001010011
3112202100002
41012321103
533243022
610120215
72316416
oct1067123
9482302
10290387
11189199
1212006b
13a2236
1477b7d
155b092
hex46e53

290387 has 4 divisors (see below), whose sum is σ = 295920. Its totient is φ = 284856.

The previous prime is 290383. The next prime is 290393. The reversal of 290387 is 783092.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 290387 - 22 = 290383 is a prime.

It is an Ulam number.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 290387.

It is not an unprimeable number, because it can be changed into a prime (290383) 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, 2687 + ... + 2792.

It is an arithmetic number, because the mean of its divisors is an integer number (73980).

2290387 is an apocalyptic number.

290387 is a deficient number, since it is larger than the sum of its proper divisors (5533).

290387 is an equidigital number, since it uses as much as digits as its factorization.

290387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5532.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 290387 is about 538.8756813960. The cubic root of 290387 is about 66.2204900019.

The spelling of 290387 in words is "two hundred ninety thousand, three hundred eighty-seven".

Divisors: 1 53 5479 290387