402400724 has 24 divisors (see below), whose sum is σ = 773388000. Its totient is φ = 181678880.

The previous prime is 402400721. The next prime is 402400729. The reversal of 402400724 is 427004204.

It is a self number, because there is not a number n which added to its sum of digits gives 402400724.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402400721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24134 + ... + 37245.

It is an arithmetic number, because the mean of its divisors is an integer number (32224500).

Almost surely, 2^402400724 is an apocalyptic number.

402400724 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

402400724 is a deficient number, since it is larger than the sum of its proper divisors (370987276).

402400724 is a wasteful number, since it uses less digits than its factorization.

402400724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61543 (or 61541 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 23.

The square root of 402400724 is about 20059.9283149268. The cubic root of 402400724 is about 738.2774176575.

Adding to 402400724 its reverse (427004204), we get a palindrome (829404928).

The spelling of 402400724 in words is "four hundred two million, four hundred thousand, seven hundred twenty-four".