19121994 has 20 divisors (see below), whose sum is σ = 42847794. Its totient is φ = 6373944.

The previous prime is 19121987. The next prime is 19122013. The reversal of 19121994 is 49912191.

It can be written as a sum of positive squares in only one way, i.e., 16916769 + 2205225 = 4113^2 + 1485^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 58857 + ... + 59180.

Almost surely, 2^19121994 is an apocalyptic number.

19121994 is an abundant number, since it is smaller than the sum of its proper divisors (23725800).

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

19121994 is a wasteful number, since it uses less digits than its factorization.

19121994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118051 (or 118042 counting only the distinct ones).

The product of its digits is 5832, while the sum is 36.

The square root of 19121994 is about 4372.8702244636. The cubic root of 19121994 is about 267.4100504044.

The spelling of 19121994 in words is "nineteen million, one hundred twenty-one thousand, nine hundred ninety-four".