402155125 has 8 divisors (see below), whose sum is σ = 501889752. Its totient is φ = 321724000.

The previous prime is 402155123. The next prime is 402155153. The reversal of 402155125 is 521551204.

It can be written as a sum of positive squares in 4 ways, for example, as 1274641 + 400880484 = 1129^2 + 20022^2 .

It is not a de Polignac number, because 402155125 - 2¹ = 402155123 is a prime.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 402155125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402155123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1608496 + ... + 1608745.

It is an arithmetic number, because the mean of its divisors is an integer number (62736219).

Almost surely, 2^402155125 is an apocalyptic number.

It is an amenable number.

402155125 is a deficient number, since it is larger than the sum of its proper divisors (99734627).

402155125 is an equidigital number, since it uses as much as digits as its factorization.

402155125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3217256 (or 3217246 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 402155125 is about 20053.8057485356. The cubic root of 402155125 is about 738.1271883911.

The spelling of 402155125 in words is "four hundred two million, one hundred fifty-five thousand, one hundred twenty-five".