19931916 has 24 divisors (see below), whose sum is σ = 46602864. Its totient is φ = 6630400.

The previous prime is 19931909. The next prime is 19931921. The reversal of 19931916 is 61913991.

It is a happy 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, 5716 + ... + 8516.

It is an arithmetic number, because the mean of its divisors is an integer number (1941786).

Almost surely, 2^19931916 is an apocalyptic number.

It is an amenable number.

19931916 is an abundant number, since it is smaller than the sum of its proper divisors (26670948).

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

19931916 is a wasteful number, since it uses less digits than its factorization.

19931916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3401 (or 3399 counting only the distinct ones).

The product of its digits is 13122, while the sum is 39.

The square root of 19931916 is about 4464.5174431287. The cubic root of 19931916 is about 271.1333974682.

The spelling of 19931916 in words is "nineteen million, nine hundred thirty-one thousand, nine hundred sixteen".