400502420 has 12 divisors (see below), whose sum is σ = 841055124. Its totient is φ = 160200960.

The previous prime is 400502363. The next prime is 400502437. The reversal of 400502420 is 24205004.

400502420 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 216737284 + 183765136 = 14722^2 + 13556^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10012541 + ... + 10012580.

It is an arithmetic number, because the mean of its divisors is an integer number (70087927).

Almost surely, 2^400502420 is an apocalyptic number.

It is an amenable number.

400502420 is an abundant number, since it is smaller than the sum of its proper divisors (440552704).

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

400502420 is a wasteful number, since it uses less digits than its factorization.

400502420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20025130 (or 20025128 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 17.

The square root of 400502420 is about 20012.5565583211. The cubic root of 400502420 is about 737.1146591767.

Adding to 400502420 its reverse (24205004), we get a palindrome (424707424).

The spelling of 400502420 in words is "four hundred million, five hundred two thousand, four hundred twenty".