402120625 has 20 divisors (see below), whose sum is σ = 516100420. Its totient is φ = 312984000.

The previous prime is 402120611. The next prime is 402120629. The reversal of 402120625 is 526021204.

It can be written as a sum of positive squares in 10 ways, for example, as 196112016 + 206008609 = 14004^2 + 14353^2 .

It is not a de Polignac number, because 402120625 - 2¹⁹ = 401596337 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 402120596 and 402120605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402120629) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 14431 + ... + 31819.

It is an arithmetic number, because the mean of its divisors is an integer number (25805021).

Almost surely, 2^402120625 is an apocalyptic number.

It is an amenable number.

402120625 is a deficient number, since it is larger than the sum of its proper divisors (113979795).

402120625 is an equidigital number, since it uses as much as digits as its factorization.

402120625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17446 (or 17431 counting only the distinct ones).

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

The square root of 402120625 is about 20052.9455442336. The cubic root of 402120625 is about 738.1060803538.

Adding to 402120625 its reverse (526021204), we get a palindrome (928141829).

The spelling of 402120625 in words is "four hundred two million, one hundred twenty thousand, six hundred twenty-five".