18901897 has 12 divisors (see below), whose sum is σ = 22501776. Its totient is φ = 15823080.

The previous prime is 18901891. The next prime is 18901901. The reversal of 18901897 is 79810981.

It is not a de Polignac number, because 18901897 - 2⁷ = 18901769 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

18901897 is a modest number, since divided by 1897 gives 189 as remainder.

It is not an unprimeable number, because it can be changed into a prime (18901891) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2379 + ... + 6592.

It is an arithmetic number, because the mean of its divisors is an integer number (1875148).

Almost surely, 2^18901897 is an apocalyptic number.

It is an amenable number.

18901897 is a deficient number, since it is larger than the sum of its proper divisors (3599879).

18901897 is an equidigital number, since it uses as much as digits as its factorization.

18901897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9028 (or 9021 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 43.

The square root of 18901897 is about 4347.6311941102. The cubic root of 18901897 is about 266.3801121500.

The spelling of 18901897 in words is "eighteen million, nine hundred one thousand, eight hundred ninety-seven".