18972292 has 6 divisors (see below), whose sum is σ = 33201518. Its totient is φ = 9486144.

The previous prime is 18972287. The next prime is 18972313. The reversal of 18972292 is 29227981.

It can be written as a sum of positive squares in only one way, i.e., 18800896 + 171396 = 4336^2 + 414^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2371533 + ... + 2371540.

Almost surely, 2^18972292 is an apocalyptic number.

It is an amenable number.

18972292 is a deficient number, since it is larger than the sum of its proper divisors (14229226).

18972292 is a wasteful number, since it uses less digits than its factorization.

18972292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4743077 (or 4743075 counting only the distinct ones).

The product of its digits is 36288, while the sum is 40.

The square root of 18972292 is about 4355.7194583674. The cubic root of 18972292 is about 266.7103893586.

The spelling of 18972292 in words is "eighteen million, nine hundred seventy-two thousand, two hundred ninety-two".