18907097 has 6 divisors (see below), whose sum is σ = 20782314. Its totient is φ = 17188160.

The previous prime is 18907069. The next prime is 18907103. The reversal of 18907097 is 79070981.

It can be written as a sum of positive squares in only one way, i.e., 11703241 + 7203856 = 3421^2 + 2684^2 .

It is not a de Polignac number, because 18907097 - 2⁸ = 18906841 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (18907067) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 78008 + ... + 78249.

It is an arithmetic number, because the mean of its divisors is an integer number (3463719).

Almost surely, 2^18907097 is an apocalyptic number.

It is an amenable number.

18907097 is a deficient number, since it is larger than the sum of its proper divisors (1875217).

18907097 is a wasteful number, since it uses less digits than its factorization.

18907097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156279 (or 156268 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 41.

The square root of 18907097 is about 4348.2291797926. The cubic root of 18907097 is about 266.4045373806.

It can be divided in two parts, 1 and 8907097, that added together give a palindrome (8907098).

The spelling of 18907097 in words is "eighteen million, nine hundred seven thousand, ninety-seven".