18961608 has 32 divisors (see below), whose sum is σ = 47784960. Its totient is φ = 6269760.

The previous prime is 18961589. The next prime is 18961609. The reversal of 18961608 is 80616981.

It is not an unprimeable number, because it can be changed into a prime (18961609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63 + ... + 6158.

It is an arithmetic number, because the mean of its divisors is an integer number (1493280).

Almost surely, 2^18961608 is an apocalyptic number.

It is an amenable number.

18961608 is an abundant number, since it is smaller than the sum of its proper divisors (28823352).

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

18961608 is a wasteful number, since it uses less digits than its factorization.

18961608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6357 (or 6353 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 18961608 is about 4354.4928522160. The cubic root of 18961608 is about 266.6603151265.

The spelling of 18961608 in words is "eighteen million, nine hundred sixty-one thousand, six hundred eight".