398505311257 has 8 divisors (see below), whose sum is σ = 400883555520. Its totient is φ = 396127926480.

The previous prime is 398505311251. The next prime is 398505311279. The reversal of 398505311257 is 752113505893.

It is a happy number.

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 398505311257 - 2¹⁵ = 398505278489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 398505311257.

It is not an unprimeable number, because it can be changed into a prime (398505311251) 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, 727494 + ... + 1151632.

It is an arithmetic number, because the mean of its divisors is an integer number (50110444440).

Almost surely, 2^398505311257 is an apocalyptic number.

It is an amenable number.

398505311257 is a deficient number, since it is larger than the sum of its proper divisors (2378244263).

398505311257 is a wasteful number, since it uses less digits than its factorization.

398505311257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429743.

The product of its (nonzero) digits is 1134000, while the sum is 49.

The spelling of 398505311257 in words is "three hundred ninety-eight billion, five hundred five million, three hundred eleven thousand, two hundred fifty-seven".