18790137 has 20 divisors (see below), whose sum is σ = 28219620. Its totient is φ = 12459744.

The previous prime is 18790129. The next prime is 18790139. The reversal of 18790137 is 73109781.

It can be written as a sum of positive squares in 2 ways, for example, as 7338681 + 11451456 = 2709^2 + 3384^2 .

It is not a de Polignac number, because 18790137 - 2³ = 18790129 is a prime.

It is a super-3 number, since 3×18790137³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (18790139) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 18043 + ... + 19055.

It is an arithmetic number, because the mean of its divisors is an integer number (1410981).

Almost surely, 2^18790137 is an apocalyptic number.

It is an amenable number.

18790137 is a deficient number, since it is larger than the sum of its proper divisors (9429483).

18790137 is a wasteful number, since it uses less digits than its factorization.

18790137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1254 (or 1245 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 36.

The square root of 18790137 is about 4334.7591628601. The cubic root of 18790137 is about 265.8540713134.

The spelling of 18790137 in words is "eighteen million, seven hundred ninety thousand, one hundred thirty-seven".