400278612 has 24 divisors (see below), whose sum is σ = 934306912. Its totient is φ = 133380000.

The previous prime is 400278607. The next prime is 400278667. The reversal of 400278612 is 216872004.

It is a self number, because there is not a number n which added to its sum of digits gives 400278612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65487 + ... + 71337.

Almost surely, 2^400278612 is an apocalyptic number.

It is an amenable number.

400278612 is an abundant number, since it is smaller than the sum of its proper divisors (534028300).

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

400278612 is a wasteful number, since it uses less digits than its factorization.

400278612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11559 (or 11557 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 400278612 is about 20006.9640875371. The cubic root of 400278612 is about 736.9773292558.

The spelling of 400278612 in words is "four hundred million, two hundred seventy-eight thousand, six hundred twelve".