19081972 has 36 divisors (see below), whose sum is σ = 41839140. Its totient is φ = 7547904.

The previous prime is 19081969. The next prime is 19081987. The reversal of 19081972 is 27918091.

It can be written as a sum of positive squares in 2 ways, for example, as 5934096 + 13147876 = 2436^2 + 3626^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1197 + ... + 6292.

Almost surely, 2^19081972 is an apocalyptic number.

It is an amenable number.

19081972 is an abundant number, since it is smaller than the sum of its proper divisors (22757168).

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

19081972 is a wasteful number, since it uses less digits than its factorization.

19081972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7520 (or 7511 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 19081972 is about 4368.2916569295. The cubic root of 19081972 is about 267.2233585720.

The spelling of 19081972 in words is "nineteen million, eighty-one thousand, nine hundred seventy-two".