401918657 has 4 divisors (see below), whose sum is σ = 459335616. Its totient is φ = 344501700.

The previous prime is 401918653. The next prime is 401918707. The reversal of 401918657 is 756819104.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 401918657 - 2² = 401918653 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401918653) 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, 28708469 + ... + 28708482.

It is an arithmetic number, because the mean of its divisors is an integer number (114833904).

Almost surely, 2^401918657 is an apocalyptic number.

It is an amenable number.

401918657 is a deficient number, since it is larger than the sum of its proper divisors (57416959).

401918657 is an equidigital number, since it uses as much as digits as its factorization.

401918657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57416958.

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 401918657 is about 20047.9090430898. The cubic root of 401918657 is about 737.9824866157.

The spelling of 401918657 in words is "four hundred one million, nine hundred eighteen thousand, six hundred fifty-seven".