402031780 has 12 divisors (see below), whose sum is σ = 844266780. Its totient is φ = 160812704.

The previous prime is 402031769. The next prime is 402031783. The reversal of 402031780 is 87130204.

402031780 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 205807716 + 196224064 = 14346^2 + 14008^2 .

It is not an unprimeable number, because it can be changed into a prime (402031783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10050775 + ... + 10050814.

It is an arithmetic number, because the mean of its divisors is an integer number (70355565).

Almost surely, 2^402031780 is an apocalyptic number.

It is an amenable number.

402031780 is an abundant number, since it is smaller than the sum of its proper divisors (442235000).

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

402031780 is a wasteful number, since it uses less digits than its factorization.

402031780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20101598 (or 20101596 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 402031780 is about 20050.7301612684. The cubic root of 402031780 is about 738.0517170104.

Adding to 402031780 its reverse (87130204), we get a palindrome (489161984).

The spelling of 402031780 in words is "four hundred two million, thirty-one thousand, seven hundred eighty".