18403697 has 16 divisors (see below), whose sum is σ = 20385792. Its totient is φ = 16511040.

The previous prime is 18403663. The next prime is 18403709. The reversal of 18403697 is 79630481.

It is not a de Polignac number, because 18403697 - 2¹⁰ = 18402673 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18403697.

It is not an unprimeable number, because it can be changed into a prime (18403607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117143 + ... + 117299.

It is an arithmetic number, because the mean of its divisors is an integer number (1274112).

Almost surely, 2^18403697 is an apocalyptic number.

It is an amenable number.

18403697 is a deficient number, since it is larger than the sum of its proper divisors (1982095).

18403697 is a wasteful number, since it uses less digits than its factorization.

18403697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 18403697 is about 4289.9530300459. The cubic root of 18403697 is about 264.0189045615.

The spelling of 18403697 in words is "eighteen million, four hundred three thousand, six hundred ninety-seven".