18499420 has 24 divisors (see below), whose sum is σ = 39007584. Its totient is φ = 7369536.

The previous prime is 18499379. The next prime is 18499421. The reversal of 18499420 is 2499481.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 18499420.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18499421) 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, 3502 + ... + 7018.

It is an arithmetic number, because the mean of its divisors is an integer number (1625316).

Almost surely, 2^18499420 is an apocalyptic number.

18499420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18499420 is an abundant number, since it is smaller than the sum of its proper divisors (20508164).

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

18499420 is a wasteful number, since it uses less digits than its factorization.

18499420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3789 (or 3787 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 18499420 is about 4301.0952093624. The cubic root of 18499420 is about 264.4758596851.

The spelling of 18499420 in words is "eighteen million, four hundred ninety-nine thousand, four hundred twenty".