400861625 has 8 divisors (see below), whose sum is σ = 500275464. Its totient is φ = 320689200.

The previous prime is 400861621. The next prime is 400861667. The reversal of 400861625 is 526168004.

It can be written as a sum of positive squares in 4 ways, for example, as 53523856 + 347337769 = 7316^2 + 18637^2 .

It is not a de Polignac number, because 400861625 - 2² = 400861621 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400861591 and 400861600.

It is not an unprimeable number, because it can be changed into a prime (400861621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1603322 + ... + 1603571.

It is an arithmetic number, because the mean of its divisors is an integer number (62534433).

Almost surely, 2^400861625 is an apocalyptic number.

It is an amenable number.

400861625 is a deficient number, since it is larger than the sum of its proper divisors (99413839).

400861625 is an equidigital number, since it uses as much as digits as its factorization.

400861625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3206908 (or 3206898 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 400861625 is about 20021.5290375136. The cubic root of 400861625 is about 737.3349625920.

The spelling of 400861625 in words is "four hundred million, eight hundred sixty-one thousand, six hundred twenty-five".