400625001 has 32 divisors (see below), whose sum is σ = 679361280. Its totient is φ = 228572928.

The previous prime is 400624993. The next prime is 400625041. The reversal of 400625001 is 100526004.

It is a happy number.

400625001 is a `hidden beast` number, since 40 + 0 + 625 + 0 + 0 + 1 = 666.

It is not a de Polignac number, because 400625001 - 2³ = 400624993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (400625041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 164545 + ... + 166961.

It is an arithmetic number, because the mean of its divisors is an integer number (21230040).

Almost surely, 2^400625001 is an apocalyptic number.

It is an amenable number.

400625001 is a deficient number, since it is larger than the sum of its proper divisors (278736279).

400625001 is a wasteful number, since it uses less digits than its factorization.

400625001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3310 (or 3304 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 400625001 is about 20015.6189262286. The cubic root of 400625001 is about 737.1898539244.

The spelling of 400625001 in words is "four hundred million, six hundred twenty-five thousand, one".