18949660 has 12 divisors (see below), whose sum is σ = 39794328. Its totient is φ = 7579856.

The previous prime is 18949643. The next prime is 18949663. The reversal of 18949660 is 6694981.

It is a super-2 number, since 2×18949660² = 718179228231200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18949663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 473722 + ... + 473761.

It is an arithmetic number, because the mean of its divisors is an integer number (3316194).

Almost surely, 2^18949660 is an apocalyptic number.

18949660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18949660 is an abundant number, since it is smaller than the sum of its proper divisors (20844668).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18949660 is a wasteful number, since it uses less digits than its factorization.

18949660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 947492 (or 947490 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 18949660 is about 4353.1207196677. The cubic root of 18949660 is about 266.6042944403.

The spelling of 18949660 in words is "eighteen million, nine hundred forty-nine thousand, six hundred sixty".