18612649 has 4 divisors (see below), whose sum is σ = 20304720. Its totient is φ = 16920580.

The previous prime is 18612623. The next prime is 18612673. The reversal of 18612649 is 94621681.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 18612649 - 2²³ = 10224041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18612619) 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, 846019 + ... + 846040.

It is an arithmetic number, because the mean of its divisors is an integer number (5076180).

Almost surely, 2^18612649 is an apocalyptic number.

It is an amenable number.

18612649 is a deficient number, since it is larger than the sum of its proper divisors (1692071).

18612649 is a wasteful number, since it uses less digits than its factorization.

18612649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1692070.

The product of its digits is 20736, while the sum is 37.

The square root of 18612649 is about 4314.2379396598. The cubic root of 18612649 is about 265.0143530852.

The spelling of 18612649 in words is "eighteen million, six hundred twelve thousand, six hundred forty-nine".