400781416 has 16 divisors (see below), whose sum is σ = 858817440. Its totient is φ = 171763440.

The previous prime is 400781401. The next prime is 400781429. The reversal of 400781416 is 614187004.

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, 3578350 + ... + 3578461.

It is an arithmetic number, because the mean of its divisors is an integer number (53676090).

Almost surely, 2^400781416 is an apocalyptic number.

It is an amenable number.

400781416 is an abundant number, since it is smaller than the sum of its proper divisors (458036024).

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

400781416 is a wasteful number, since it uses less digits than its factorization.

400781416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7156824 (or 7156820 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 400781416 is about 20019.5258685115. The cubic root of 400781416 is about 737.2857811610.

The spelling of 400781416 in words is "four hundred million, seven hundred eighty-one thousand, four hundred sixteen".