402525421 has 6 divisors (see below), whose sum is σ = 415929966. Its totient is φ = 389539800.

The previous prime is 402525419. The next prime is 402525449. The reversal of 402525421 is 124525204.

It can be written as a sum of positive squares in only one way, i.e., 270964521 + 131560900 = 16461^2 + 11470^2 .

It is not a de Polignac number, because 402525421 - 2¹ = 402525419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402525491) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 208470 + ... + 210391.

It is an arithmetic number, because the mean of its divisors is an integer number (69321661).

Almost surely, 2^402525421 is an apocalyptic number.

It is an amenable number.

402525421 is a deficient number, since it is larger than the sum of its proper divisors (13404545).

402525421 is an equidigital number, since it uses as much as digits as its factorization.

402525421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418923 (or 418892 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 402525421 is about 20063.0361859814. The cubic root of 402525421 is about 738.3536695676.

The spelling of 402525421 in words is "four hundred two million, five hundred twenty-five thousand, four hundred twenty-one".