400305860 has 12 divisors (see below), whose sum is σ = 840642348. Its totient is φ = 160122336.

The previous prime is 400305839. The next prime is 400305907. The reversal of 400305860 is 68503004.

It can be written as a sum of positive squares in 2 ways, for example, as 107827456 + 292478404 = 10384^2 + 17102^2 .

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, 10007627 + ... + 10007666.

It is an arithmetic number, because the mean of its divisors is an integer number (70053529).

Almost surely, 2^400305860 is an apocalyptic number.

It is an amenable number.

400305860 is an abundant number, since it is smaller than the sum of its proper divisors (440336488).

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

400305860 is a wasteful number, since it uses less digits than its factorization.

400305860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20015302 (or 20015300 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 400305860 is about 20007.6450388345. The cubic root of 400305860 is about 736.9940515271.

Adding to 400305860 its reverse (68503004), we get a palindrome (468808864).

The spelling of 400305860 in words is "four hundred million, three hundred five thousand, eight hundred sixty".