402544025 has 12 divisors (see below), whose sum is σ = 537551532. Its totient is φ = 297263040.

The previous prime is 402544001. The next prime is 402544039. The reversal of 402544025 is 520445204.

It can be written as a sum of positive squares in 6 ways, for example, as 132894784 + 269649241 = 11528^2 + 16421^2 .

It is not a de Polignac number, because 402544025 - 2²⁴ = 385766809 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 402543985 and 402544003.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 618974 + ... + 619623.

It is an arithmetic number, because the mean of its divisors is an integer number (44795961).

Almost surely, 2^402544025 is an apocalyptic number.

It is an amenable number.

402544025 is a deficient number, since it is larger than the sum of its proper divisors (135007507).

402544025 is a wasteful number, since it uses less digits than its factorization.

402544025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1238620 (or 1238615 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 26.

The square root of 402544025 is about 20063.4998193236. The cubic root of 402544025 is about 738.3650445179.

Adding to 402544025 its reverse (520445204), we get a palindrome (922989229).

The spelling of 402544025 in words is "four hundred two million, five hundred forty-four thousand, twenty-five".