19115990 has 32 divisors (see below), whose sum is σ = 38024640. Its totient is φ = 6882304.

The previous prime is 19115983. The next prime is 19116001. The reversal of 19115990 is 9951191.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 19115990.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1466 + ... + 6354.

It is an arithmetic number, because the mean of its divisors is an integer number (1188270).

Almost surely, 2^19115990 is an apocalyptic number.

19115990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19115990 is a deficient number, since it is larger than the sum of its proper divisors (18908650).

19115990 is a wasteful number, since it uses less digits than its factorization.

19115990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4936.

The product of its (nonzero) digits is 3645, while the sum is 35.

The square root of 19115990 is about 4372.1836649436. The cubic root of 19115990 is about 267.3820599831.

The spelling of 19115990 in words is "nineteen million, one hundred fifteen thousand, nine hundred ninety".