18939137 has 12 divisors (see below), whose sum is σ = 22120560. Its totient is φ = 16167816.

The previous prime is 18939131. The next prime is 18939157. The reversal of 18939137 is 73193981.

It is not a de Polignac number, because 18939137 - 2⁴ = 18939121 is a prime.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 18939094 and 18939103.

It is not an unprimeable number, because it can be changed into a prime (18939131) 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, 14414 + ... + 15672.

It is an arithmetic number, because the mean of its divisors is an integer number (1843380).

Almost surely, 2^18939137 is an apocalyptic number.

It is an amenable number.

18939137 is a deficient number, since it is larger than the sum of its proper divisors (3181423).

18939137 is a wasteful number, since it uses less digits than its factorization.

18939137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1580 (or 1573 counting only the distinct ones).

The product of its digits is 40824, while the sum is 41.

The square root of 18939137 is about 4351.9118787034. The cubic root of 18939137 is about 266.5549356575.

The spelling of 18939137 in words is "eighteen million, nine hundred thirty-nine thousand, one hundred thirty-seven".