402012440 has 32 divisors (see below), whose sum is σ = 905143680. Its totient is φ = 160695552.

The previous prime is 402012427. The next prime is 402012451. The reversal of 402012440 is 44210204.

It is a super-2 number, since 2×402012440² = 323228003829507200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83129 + ... + 87831.

It is an arithmetic number, because the mean of its divisors is an integer number (28285740).

Almost surely, 2^402012440 is an apocalyptic number.

402012440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

402012440 is an abundant number, since it is smaller than the sum of its proper divisors (503131240).

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

402012440 is a wasteful number, since it uses less digits than its factorization.

402012440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6851 (or 6847 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 402012440 is about 20050.2478787670. The cubic root of 402012440 is about 738.0398820015.

Adding to 402012440 its reverse (44210204), we get a palindrome (446222644).

The spelling of 402012440 in words is "four hundred two million, twelve thousand, four hundred forty".