401645903 has 4 divisors (see below), whose sum is σ = 402089640. Its totient is φ = 401202168.

The previous prime is 401645891. The next prime is 401645917. The reversal of 401645903 is 309546104.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-401645903 is a prime.

It is a super-2 number, since 2×401645903² = 322638862793370818, which contains 22 as substring.

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 401645903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401645003) 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, 220508 + ... + 222321.

It is an arithmetic number, because the mean of its divisors is an integer number (100522410).

Almost surely, 2^401645903 is an apocalyptic number.

401645903 is a deficient number, since it is larger than the sum of its proper divisors (443737).

401645903 is an equidigital number, since it uses as much as digits as its factorization.

401645903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443736.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 401645903 is about 20041.1053337884. The cubic root of 401645903 is about 737.8155098555.

The spelling of 401645903 in words is "four hundred one million, six hundred forty-five thousand, nine hundred three".