400430502 has 24 divisors (see below), whose sum is σ = 891049536. Its totient is φ = 129869136.

The previous prime is 400430489. The next prime is 400430509. The reversal of 400430502 is 205034004.

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 not an unprimeable number, because it can be changed into a prime (400430509) 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 11 ways as a sum of consecutive naturals, for example, 299958 + ... + 301289.

It is an arithmetic number, because the mean of its divisors is an integer number (37127064).

Almost surely, 2^400430502 is an apocalyptic number.

400430502 is an abundant number, since it is smaller than the sum of its proper divisors (490619034).

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

400430502 is a wasteful number, since it uses less digits than its factorization.

400430502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601292 (or 601289 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 400430502 is about 20010.7596557452. The cubic root of 400430502 is about 737.0705354438.

Adding to 400430502 its reverse (205034004), we get a palindrome (605464506).

The spelling of 400430502 in words is "four hundred million, four hundred thirty thousand, five hundred two".