18698949 has 24 divisors (see below), whose sum is σ = 27974232. Its totient is φ = 12026880.

The previous prime is 18698941. The next prime is 18698951. The reversal of 18698949 is 94989681.

It can be written as a sum of positive squares in 4 ways, for example, as 5846724 + 12852225 = 2418^2 + 3585^2 .

It is not a de Polignac number, because 18698949 - 2³ = 18698941 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18698895 and 18698904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18698941) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 77469 + ... + 77709.

It is an arithmetic number, because the mean of its divisors is an integer number (1165593).

Almost surely, 2^18698949 is an apocalyptic number.

It is an amenable number.

18698949 is a deficient number, since it is larger than the sum of its proper divisors (9275283).

18698949 is a wasteful number, since it uses less digits than its factorization.

18698949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517 (or 514 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 54.

The square root of 18698949 is about 4324.2281392174. The cubic root of 18698949 is about 265.4233129940.

The spelling of 18698949 in words is "eighteen million, six hundred ninety-eight thousand, nine hundred forty-nine".