18422739 has 6 divisors (see below), whose sum is σ = 26610636. Its totient is φ = 12281820.

The previous prime is 18422737. The next prime is 18422753. The reversal of 18422739 is 93722481.

It is not a de Polignac number, because 18422739 - 2¹ = 18422737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18422737) 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 5 ways as a sum of consecutive naturals, for example, 1023477 + ... + 1023494.

It is an arithmetic number, because the mean of its divisors is an integer number (4435106).

Almost surely, 2^18422739 is an apocalyptic number.

18422739 is a deficient number, since it is larger than the sum of its proper divisors (8187897).

18422739 is a wasteful number, since it uses less digits than its factorization.

18422739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2046977 (or 2046974 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 18422739 is about 4292.1718278746. The cubic root of 18422739 is about 264.1099318342.

The spelling of 18422739 in words is "eighteen million, four hundred twenty-two thousand, seven hundred thirty-nine".