407981916 has 36 divisors (see below), whose sum is σ = 1050750792. Its totient is φ = 133427424.

The previous prime is 407981887. The next prime is 407981971. The reversal of 407981916 is 619189704.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 105006 + ... + 108821.

It is an arithmetic number, because the mean of its divisors is an integer number (29187522).

Almost surely, 2^407981916 is an apocalyptic number.

It is an amenable number.

407981916 is an abundant number, since it is smaller than the sum of its proper divisors (642768876).

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

407981916 is a wasteful number, since it uses less digits than its factorization.

407981916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213890 (or 213885 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 407981916 is about 20198.5622260596. The cubic root of 407981916 is about 741.6749956449.

The spelling of 407981916 in words is "four hundred seven million, nine hundred eighty-one thousand, nine hundred sixteen".