19949090 has 32 divisors (see below), whose sum is σ = 41192064. Its totient is φ = 6814080.

The previous prime is 19949077. The next prime is 19949093. The reversal of 19949090 is 9094991.

It is not an unprimeable number, because it can be changed into a prime (19949093) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36197 + ... + 36743.

It is an arithmetic number, because the mean of its divisors is an integer number (1287252).

Almost surely, 2^19949090 is an apocalyptic number.

19949090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19949090 is the 3647-th pentagonal number.

19949090 is an abundant number, since it is smaller than the sum of its proper divisors (21242974).

19949090 is a wasteful number, since it uses less digits than its factorization.

19949090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1082.

The product of its (nonzero) digits is 26244, while the sum is 41.

The square root of 19949090 is about 4466.4404171555. The cubic root of 19949090 is about 271.2112476228.

The spelling of 19949090 in words is "nineteen million, nine hundred forty-nine thousand, ninety".