18797971 has 8 divisors (see below), whose sum is σ = 20157120. Its totient is φ = 17467008.

The previous prime is 18797963. The next prime is 18797981. The reversal of 18797971 is 17979781.

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 18797971 - 2³ = 18797963 is a prime.

It is a Duffinian number.

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, 5656 + ... + 8341.

It is an arithmetic number, because the mean of its divisors is an integer number (2519640).

Almost surely, 2^18797971 is an apocalyptic number.

18797971 is a deficient number, since it is larger than the sum of its proper divisors (1359149).

18797971 is a wasteful number, since it uses less digits than its factorization.

18797971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14093.

The product of its digits is 222264, while the sum is 49.

The square root of 18797971 is about 4335.6626944448. The cubic root of 18797971 is about 265.8910128823.

The spelling of 18797971 in words is "eighteen million, seven hundred ninety-seven thousand, nine hundred seventy-one".