19481864 has 16 divisors (see below), whose sum is σ = 38677500. Its totient is φ = 9167872.

The previous prime is 19481849. The next prime is 19481873. The reversal of 19481864 is 46818491.

It can be written as a sum of positive squares in 2 ways, for example, as 19272100 + 209764 = 4390^2 + 458^2 .

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, 71489 + ... + 71760.

Almost surely, 2^19481864 is an apocalyptic number.

It is an amenable number.

19481864 is a deficient number, since it is larger than the sum of its proper divisors (19195636).

19481864 is a wasteful number, since it uses less digits than its factorization.

19481864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143272 (or 143268 counting only the distinct ones).

The product of its digits is 55296, while the sum is 41.

The square root of 19481864 is about 4413.8264578481. The cubic root of 19481864 is about 269.0771603253.

The spelling of 19481864 in words is "nineteen million, four hundred eighty-one thousand, eight hundred sixty-four".