402401020 has 48 divisors (see below), whose sum is σ = 979388928. Its totient is φ = 136019520.

The previous prime is 402401017. The next prime is 402401053. The reversal of 402401020 is 20104204.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 10302 + ... + 30181.

It is an arithmetic number, because the mean of its divisors is an integer number (20403936).

Almost surely, 2^402401020 is an apocalyptic number.

It is an amenable number.

402401020 is an abundant number, since it is smaller than the sum of its proper divisors (576987908).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

402401020 is a wasteful number, since it uses less digits than its factorization.

402401020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40570 (or 40568 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 402401020 is about 20059.9356928182. The cubic root of 402401020 is about 738.2775986794.

Adding to 402401020 its reverse (20104204), we get a palindrome (422505224).

The spelling of 402401020 in words is "four hundred two million, four hundred one thousand, twenty".