19618972 has 12 divisors (see below), whose sum is σ = 34384840. Its totient is φ = 9794736.

The previous prime is 19618967. The next prime is 19619009. The reversal of 19618972 is 27981691.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 363 + ... + 6274.

Almost surely, 2^19618972 is an apocalyptic number.

It is an amenable number.

19618972 is a deficient number, since it is larger than the sum of its proper divisors (14765868).

19618972 is a wasteful number, since it uses less digits than its factorization.

19618972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7380 (or 7378 counting only the distinct ones).

The product of its digits is 54432, while the sum is 43.

The square root of 19618972 is about 4429.3308749742. The cubic root of 19618972 is about 269.7069156261.

The spelling of 19618972 in words is "nineteen million, six hundred eighteen thousand, nine hundred seventy-two".