18949380 has 48 divisors (see below), whose sum is σ = 54359424. Its totient is φ = 4929280.

The previous prime is 18949367. The next prime is 18949387. The reversal of 18949380 is 8394981.

It is not an unprimeable number, because it can be changed into a prime (18949387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1392 + ... + 6311.

It is an arithmetic number, because the mean of its divisors is an integer number (1132488).

Almost surely, 2^18949380 is an apocalyptic number.

18949380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18949380 is an abundant number, since it is smaller than the sum of its proper divisors (35410044).

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

18949380 is a wasteful number, since it uses less digits than its factorization.

18949380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7756 (or 7754 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 18949380 is about 4353.0885587132. The cubic root of 18949380 is about 266.6029813197.

The spelling of 18949380 in words is "eighteen million, nine hundred forty-nine thousand, three hundred eighty".