19308990 has 16 divisors (see below), whose sum is σ = 46341648. Its totient is φ = 5149056.

The previous prime is 19308979. The next prime is 19309009. The reversal of 19308990 is 9980391.

It is a Curzon number.

It is a congruent number.

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, 321787 + ... + 321846.

It is an arithmetic number, because the mean of its divisors is an integer number (2896353).

Almost surely, 2^19308990 is an apocalyptic number.

19308990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19308990 is an abundant number, since it is smaller than the sum of its proper divisors (27032658).

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

19308990 is a wasteful number, since it uses less digits than its factorization.

19308990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643643.

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 19308990 is about 4394.1995858176. The cubic root of 19308990 is about 268.2789013810.

The spelling of 19308990 in words is "nineteen million, three hundred eight thousand, nine hundred ninety".