18937089 has 12 divisors (see below), whose sum is σ = 27436500. Its totient is φ = 12586464.

The previous prime is 18937033. The next prime is 18937103. The reversal of 18937089 is 98073981.

It can be written as a sum of positive squares in 2 ways, for example, as 16064064 + 2873025 = 4008^2 + 1695^2 .

It is not a de Polignac number, because 18937089 - 2¹² = 18932993 is a prime.

It is a super-2 number, since 2×18937089² = 717226679587842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18930089) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 127 + ... + 6155.

It is an arithmetic number, because the mean of its divisors is an integer number (2286375).

Almost surely, 2^18937089 is an apocalyptic number.

It is an amenable number.

18937089 is a deficient number, since it is larger than the sum of its proper divisors (8499411).

18937089 is a wasteful number, since it uses less digits than its factorization.

18937089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6384 (or 6381 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 18937089 is about 4351.6765734599. The cubic root of 18937089 is about 266.5453272615.

The spelling of 18937089 in words is "eighteen million, nine hundred thirty-seven thousand, eighty-nine".