256619397 has 8 divisors (see below), whose sum is σ = 342250560. Its totient is φ = 171033920.

The previous prime is 256619393. The next prime is 256619401. The reversal of 256619397 is 793916652.

It is an interprime number because it is at equal distance from previous prime (256619393) and next prime (256619401).

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

It is a cyclic number.

It is not a de Polignac number, because 256619397 - 2² = 256619393 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256619393) 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, 5104 + ... + 23222.

It is an arithmetic number, because the mean of its divisors is an integer number (42781320).

Almost surely, 2^256619397 is an apocalyptic number.

It is an amenable number.

256619397 is a deficient number, since it is larger than the sum of its proper divisors (85631163).

256619397 is a wasteful number, since it uses less digits than its factorization.

256619397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22843.

The product of its digits is 612360, while the sum is 48.

The square root of 256619397 is about 16019.3444622431. The cubic root of 256619397 is about 635.4721080430.

The spelling of 256619397 in words is "two hundred fifty-six million, six hundred nineteen thousand, three hundred ninety-seven".