400307725 has 6 divisors (see below), whose sum is σ = 496381610. Its totient is φ = 320246160.

The previous prime is 400307717. The next prime is 400307731. The reversal of 400307725 is 527703004.

It can be written as a sum of positive squares in 3 ways, for example, as 427716 + 399880009 = 654^2 + 19997^2 .

It is not a de Polignac number, because 400307725 - 2³ = 400307717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 400307693 and 400307702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8006130 + ... + 8006179.

Almost surely, 2^400307725 is an apocalyptic number.

It is an amenable number.

400307725 is a deficient number, since it is larger than the sum of its proper divisors (96073885).

400307725 is a wasteful number, since it uses less digits than its factorization.

400307725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16012319 (or 16012314 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 28.

The square root of 400307725 is about 20007.6916459646. The cubic root of 400307725 is about 736.9951960617.

The spelling of 400307725 in words is "four hundred million, three hundred seven thousand, seven hundred twenty-five".