18797947 has 8 divisors (see below), whose sum is σ = 21509600. Its totient is φ = 16092864.

The previous prime is 18797941. The next prime is 18797951. The reversal of 18797947 is 74979781.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18797947 - 2³ = 18797939 is a prime.

It is a super-2 number, since 2×18797947² = 706725622829618, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18797894 and 18797903.

It is not an unprimeable number, because it can be changed into a prime (18797941) 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, 10429 + ... + 12097.

It is an arithmetic number, because the mean of its divisors is an integer number (2688700).

Almost surely, 2^18797947 is an apocalyptic number.

18797947 is a deficient number, since it is larger than the sum of its proper divisors (2711653).

18797947 is a wasteful number, since it uses less digits than its factorization.

18797947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3285.

The product of its digits is 889056, while the sum is 52.

The square root of 18797947 is about 4335.6599267009. The cubic root of 18797947 is about 265.8908997249.

The spelling of 18797947 in words is "eighteen million, seven hundred ninety-seven thousand, nine hundred forty-seven".