18422649 has 24 divisors (see below), whose sum is σ = 31396352. Its totient is φ = 10186560.

The previous prime is 18422629. The next prime is 18422659. The reversal of 18422649 is 94622481.

18422649 is a `hidden beast` number, since 1 + 8 + 4 + 2 + 2 + 649 = 666.

It is not a de Polignac number, because 18422649 - 2⁵ = 18422617 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18422629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2764 + ... + 6669.

Almost surely, 2^18422649 is an apocalyptic number.

It is an amenable number.

18422649 is a deficient number, since it is larger than the sum of its proper divisors (12973703).

18422649 is a wasteful number, since it uses less digits than its factorization.

18422649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9477 (or 9474 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 18422649 is about 4292.1613436589. The cubic root of 18422649 is about 264.1095017510.

The spelling of 18422649 in words is "eighteen million, four hundred twenty-two thousand, six hundred forty-nine".