18740490 has 16 divisors (see below), whose sum is σ = 44977248. Its totient is φ = 4997456.

The previous prime is 18740489. The next prime is 18740531. The reversal of 18740490 is 9404781.

18740490 = 1934² + 1935² + ... + 1938².

It is an unprimeable number.

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, 312312 + ... + 312371.

It is an arithmetic number, because the mean of its divisors is an integer number (2811078).

Almost surely, 2^18740490 is an apocalyptic number.

18740490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18740490 is an abundant number, since it is smaller than the sum of its proper divisors (26236758).

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

18740490 is a wasteful number, since it uses less digits than its factorization.

18740490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624693.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 18740490 is about 4329.0287594332. The cubic root of 18740490 is about 265.6197196644.

The spelling of 18740490 in words is "eighteen million, seven hundred forty thousand, four hundred ninety".