18797972 has 6 divisors (see below), whose sum is σ = 32896458. Its totient is φ = 9398984.

The previous prime is 18797963. The next prime is 18797981. The reversal of 18797972 is 27979781.

It is an interprime number because it is at equal distance from previous prime (18797963) and next prime (18797981).

It can be written as a sum of positive squares in only one way, i.e., 9821956 + 8976016 = 3134^2 + 2996^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18797972.

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 as a sum of consecutive naturals, namely, 2349743 + ... + 2349750.

It is an arithmetic number, because the mean of its divisors is an integer number (5482743).

Almost surely, 2^18797972 is an apocalyptic number.

It is an amenable number.

18797972 is a deficient number, since it is larger than the sum of its proper divisors (14098486).

18797972 is a wasteful number, since it uses less digits than its factorization.

18797972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4699497 (or 4699495 counting only the distinct ones).

The product of its digits is 444528, while the sum is 50.

The square root of 18797972 is about 4335.6628097674. The cubic root of 18797972 is about 265.8910175972.

The spelling of 18797972 in words is "eighteen million, seven hundred ninety-seven thousand, nine hundred seventy-two".