402040440 has 96 divisors (see below), whose sum is σ = 1318327920. Its totient is φ = 106251264.

The previous prime is 402040439. The next prime is 402040477. The reversal of 402040440 is 44040204.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35739 + ... + 45621.

Almost surely, 2^402040440 is an apocalyptic number.

402040440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 402040440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (659163960).

402040440 is an abundant number, since it is smaller than the sum of its proper divisors (916287480).

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

402040440 is a wasteful number, since it uses less digits than its factorization.

402040440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10013 (or 10006 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

The square root of 402040440 is about 20050.9461123409. The cubic root of 402040440 is about 738.0570163277.

Adding to 402040440 its reverse (44040204), we get a palindrome (446080644).

The spelling of 402040440 in words is "four hundred two million, forty thousand, four hundred forty".