18949860 has 36 divisors (see below), whose sum is σ = 57481788. Its totient is φ = 5053248.

The previous prime is 18949841. The next prime is 18949867. The reversal of 18949860 is 6894981.

It can be written as a sum of positive squares in 2 ways, for example, as 8020224 + 10929636 = 2832^2 + 3306^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (18949867) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52459 + ... + 52818.

Almost surely, 2^18949860 is an apocalyptic number.

18949860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18949860 is an abundant number, since it is smaller than the sum of its proper divisors (38531928).

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

18949860 is a wasteful number, since it uses less digits than its factorization.

18949860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105292 (or 105287 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 18949860 is about 4353.1436916325. The cubic root of 18949860 is about 266.6052323757.

The spelling of 18949860 in words is "eighteen million, nine hundred forty-nine thousand, eight hundred sixty".