18690349 has 6 divisors (see below), whose sum is σ = 19098734. Its totient is φ = 18290520.

The previous prime is 18690341. The next prime is 18690377. The reversal of 18690349 is 94309681.

It can be written as a sum of positive squares in only one way, i.e., 17892900 + 797449 = 4230^2 + 893^2 .

It is not a de Polignac number, because 18690349 - 2³ = 18690341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18690341) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2022 + ... + 6439.

Almost surely, 2^18690349 is an apocalyptic number.

It is an amenable number.

18690349 is a deficient number, since it is larger than the sum of its proper divisors (408385).

18690349 is an frugal number, since it uses more digits than its factorization.

18690349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8555 (or 8508 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 18690349 is about 4323.2336277375. The cubic root of 18690349 is about 265.3826156884.

The spelling of 18690349 in words is "eighteen million, six hundred ninety thousand, three hundred forty-nine".