400641025 has 24 divisors (see below), whose sum is σ = 519681024. Its totient is φ = 305817600.

The previous prime is 400641013. The next prime is 400641029. The reversal of 400641025 is 520146004.

It is a de Polignac number, because none of the positive numbers 2^k-400641025 is a prime.

It is a Duffinian number.

400641025 is a modest number, since divided by 641025 gives 400 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 400640987 and 400641005.

It is not an unprimeable number, because it can be changed into a prime (400641029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 368032 + ... + 369118.

It is an arithmetic number, because the mean of its divisors is an integer number (21653376).

Almost surely, 2^400641025 is an apocalyptic number.

It is an amenable number.

400641025 is a deficient number, since it is larger than the sum of its proper divisors (119039999).

400641025 is a wasteful number, since it uses less digits than its factorization.

400641025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1761 (or 1756 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 400641025 is about 20016.0192096231. The cubic root of 400641025 is about 737.1996823780.

Adding to 400641025 its reverse (520146004), we get a palindrome (920787029).

The spelling of 400641025 in words is "four hundred million, six hundred forty-one thousand, twenty-five".