19368990 has 64 divisors (see below), whose sum is σ = 53913600. Its totient is φ = 4938912.

The previous prime is 19368959. The next prime is 19368997. The reversal of 19368990 is 9986391.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19368997) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4651 + ... + 7769.

It is an arithmetic number, because the mean of its divisors is an integer number (842400).

Almost surely, 2^19368990 is an apocalyptic number.

19368990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 19368990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26956800).

19368990 is an abundant number, since it is smaller than the sum of its proper divisors (34544610).

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

19368990 is a wasteful number, since it uses less digits than its factorization.

19368990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3158 (or 3152 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 19368990 is about 4401.0214723403. The cubic root of 19368990 is about 268.5564938396.

The spelling of 19368990 in words is "nineteen million, three hundred sixty-eight thousand, nine hundred ninety".