19999974 has 32 divisors (see below), whose sum is σ = 41199840. Its totient is φ = 6469632.

The previous prime is 19999963. The next prime is 19999981. The reversal of 19999974 is 47999991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34374 + ... + 34950.

It is an arithmetic number, because the mean of its divisors is an integer number (1287495).

Almost surely, 2^19999974 is an apocalyptic number.

19999974 is an abundant number, since it is smaller than the sum of its proper divisors (21199866).

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

19999974 is a wasteful number, since it uses less digits than its factorization.

19999974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744.

The product of its digits is 1653372, while the sum is 57.

The square root of 19999974 is about 4472.1330481103. The cubic root of 19999974 is about 271.4416440347.

The spelling of 19999974 in words is "nineteen million, nine hundred ninety-nine thousand, nine hundred seventy-four".