19997974 has 8 divisors (see below), whose sum is σ = 30020400. Its totient is φ = 9991176.

The previous prime is 19997963. The next prime is 19997993. The reversal of 19997974 is 47979991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

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, 127 + ... + 6325.

It is an arithmetic number, because the mean of its divisors is an integer number (3752550).

Almost surely, 2^19997974 is an apocalyptic number.

19997974 is a deficient number, since it is larger than the sum of its proper divisors (10022426).

19997974 is a wasteful number, since it uses less digits than its factorization.

19997974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7814.

The product of its digits is 1285956, while the sum is 55.

The square root of 19997974 is about 4471.9094355767. The cubic root of 19997974 is about 271.4325956665.

The spelling of 19997974 in words is "nineteen million, nine hundred ninety-seven thousand, nine hundred seventy-four".