19318990 has 16 divisors (see below), whose sum is σ = 34841520. Its totient is φ = 7712640.

The previous prime is 19318979. The next prime is 19318993. The reversal of 19318990 is 9981391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19318993) 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, 4630 + ... + 7750.

It is an arithmetic number, because the mean of its divisors is an integer number (2177595).

Almost surely, 2^19318990 is an apocalyptic number.

19318990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19318990 is a deficient number, since it is larger than the sum of its proper divisors (15522530).

19318990 is a wasteful number, since it uses less digits than its factorization.

19318990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3747.

The product of its (nonzero) digits is 17496, while the sum is 40.

The square root of 19318990 is about 4395.3373021874. The cubic root of 19318990 is about 268.3252066861.

The spelling of 19318990 in words is "nineteen million, three hundred eighteen thousand, nine hundred ninety".