402489370820 has 24 divisors (see below), whose sum is σ = 845255656728. Its totient is φ = 160990419200.

The previous prime is 402489370817. The next prime is 402489370823. The reversal of 402489370820 is 28073984204.

It is an interprime number because it is at equal distance from previous prime (402489370817) and next prime (402489370823).

It can be written as a sum of positive squares in 4 ways, for example, as 1706681344 + 400782689476 = 41312^2 + 633074^2 .

It is not an unprimeable number, because it can be changed into a prime (402489370823) 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, 317210 + ... + 951630.

It is an arithmetic number, because the mean of its divisors is an integer number (35218985697).

Almost surely, 2^402489370820 is an apocalyptic number.

It is a pronic number, being equal to 634420×634421.

It is an amenable number.

402489370820 is an abundant number, since it is smaller than the sum of its proper divisors (442766285908).

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

402489370820 is a wasteful number, since it uses less digits than its factorization.

402489370820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666151 (or 666149 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 47.

The spelling of 402489370820 in words is "four hundred two billion, four hundred eighty-nine million, three hundred seventy thousand, eight hundred twenty".