402246640 has 40 divisors (see below), whose sum is σ = 944502048. Its totient is φ = 159302400.

The previous prime is 402246631. The next prime is 402246653. The reversal of 402246640 is 46642204.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 402246599 and 402246608.

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 7 ways as a sum of consecutive naturals, for example, 16812 + ... + 32971.

Almost surely, 2^402246640 is an apocalyptic number.

402246640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

402246640 is an abundant number, since it is smaller than the sum of its proper divisors (542255408).

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

402246640 is a wasteful number, since it uses less digits than its factorization.

402246640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49897 (or 49891 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

The square root of 402246640 is about 20056.0873552146. The cubic root of 402246640 is about 738.1831739070.

Adding to 402246640 its reverse (46642204), we get a palindrome (448888844).

It can be divided in two parts, 40224 and 6640, that added together give a palindrome (46864).

The spelling of 402246640 in words is "four hundred two million, two hundred forty-six thousand, six hundred forty".