400121264 has 20 divisors (see below), whose sum is σ = 777442056. Its totient is φ = 199491072.

The previous prime is 400121263. The next prime is 400121287. The reversal of 400121264 is 462121004.

It is not an unprimeable number, because it can be changed into a prime (400121261) 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 3 ways as a sum of consecutive naturals, for example, 29774 + ... + 41069.

Almost surely, 2^400121264 is an apocalyptic number.

It is an amenable number.

400121264 is a deficient number, since it is larger than the sum of its proper divisors (377320792).

400121264 is a wasteful number, since it uses less digits than its factorization.

400121264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71204 (or 71198 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 400121264 is about 20003.0313702699. The cubic root of 400121264 is about 736.8807489379.

Adding to 400121264 its reverse (462121004), we get a palindrome (862242268).

The spelling of 400121264 in words is "four hundred million, one hundred twenty-one thousand, two hundred sixty-four".