400306725 has 240 divisors, whose sum is σ = 972507200. Its totient is φ = 160030080.

The previous prime is 400306717. The next prime is 400306741. The reversal of 400306725 is 527603004.

It is a happy number.

It is not a de Polignac number, because 400306725 - 2³ = 400306717 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 21068766 + ... + 21068784.

Almost surely, 2^400306725 is an apocalyptic number.

400306725 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

400306725 is an abundant number, since it is smaller than the sum of its proper divisors (572200475).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400306725 is a wasteful number, since it uses less digits than its factorization.

400306725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79 (or 47 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 27.

The square root of 400306725 is about 20007.6666555598. Note that the first 4 decimals coincide. The cubic root of 400306725 is about 736.9945823707.

Adding to 400306725 its reverse (527603004), we get a palindrome (927909729).

The spelling of 400306725 in words is "four hundred million, three hundred six thousand, seven hundred twenty-five".