18863490 has 16 divisors (see below), whose sum is σ = 45272448. Its totient is φ = 5030256.

The previous prime is 18863483. The next prime is 18863491. The reversal of 18863490 is 9436881.

It is not an unprimeable number, because it can be changed into a prime (18863491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 314362 + ... + 314421.

It is an arithmetic number, because the mean of its divisors is an integer number (2829528).

Almost surely, 2^18863490 is an apocalyptic number.

18863490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18863490 is an abundant number, since it is smaller than the sum of its proper divisors (26408958).

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

18863490 is a wasteful number, since it uses less digits than its factorization.

18863490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628793.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 18863490 is about 4343.2119450932. The cubic root of 18863490 is about 266.1995694562.

The spelling of 18863490 in words is "eighteen million, eight hundred sixty-three thousand, four hundred ninety".