19881974 has 32 divisors (see below), whose sum is σ = 35807232. Its totient is φ = 8100000.

The previous prime is 19881973. The next prime is 19882003. The reversal of 19881974 is 47918891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19881971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26099 + ... + 26849.

It is an arithmetic number, because the mean of its divisors is an integer number (1118976).

Almost surely, 2^19881974 is an apocalyptic number.

19881974 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

19881974 is a deficient number, since it is larger than the sum of its proper divisors (15925258).

19881974 is a wasteful number, since it uses less digits than its factorization.

19881974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 852.

The product of its digits is 145152, while the sum is 47.

The square root of 19881974 is about 4458.9207214302. The cubic root of 19881974 is about 270.9067547739.

The spelling of 19881974 in words is "nineteen million, eight hundred eighty-one thousand, nine hundred seventy-four".