19987372190 has 16 divisors (see below), whose sum is σ = 36656087328. Its totient is φ = 7844100576.

The previous prime is 19987372177. The next prime is 19987372193. The reversal of 19987372190 is 9127378991.

It is a super-2 number, since 2×19987372190² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19987372193) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18855482 + ... + 18856541.

It is an arithmetic number, because the mean of its divisors is an integer number (2291005458).

Almost surely, 2^19987372190 is an apocalyptic number.

19987372190 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19987372190 is a deficient number, since it is larger than the sum of its proper divisors (16668715138).

19987372190 is a wasteful number, since it uses less digits than its factorization.

19987372190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37712083.

The product of its (nonzero) digits is 1714608, while the sum is 56.

The spelling of 19987372190 in words is "nineteen billion, nine hundred eighty-seven million, three hundred seventy-two thousand, one hundred ninety".