18406601 has 4 divisors (see below), whose sum is σ = 19206912. Its totient is φ = 17606292.

The previous prime is 18406571. The next prime is 18406607. The reversal of 18406601 is 10660481.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10660481 = 13 ⋅820037.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18406601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18406607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 400121 + ... + 400166.

It is an arithmetic number, because the mean of its divisors is an integer number (4801728).

Almost surely, 2^18406601 is an apocalyptic number.

It is an amenable number.

18406601 is a deficient number, since it is larger than the sum of its proper divisors (800311).

18406601 is an equidigital number, since it uses as much as digits as its factorization.

18406601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800310.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 18406601 is about 4290.2914819392. The cubic root of 18406601 is about 264.0327907311.

The spelling of 18406601 in words is "eighteen million, four hundred six thousand, six hundred one".