19999490 has 16 divisors (see below), whose sum is σ = 41141952. Its totient is φ = 6856944.

The previous prime is 19999481. The next prime is 19999501. The reversal of 19999490 is 9499991.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142784 + ... + 142923.

It is an arithmetic number, because the mean of its divisors is an integer number (2571372).

Almost surely, 2^19999490 is an apocalyptic number.

19999490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19999490 is an abundant number, since it is smaller than the sum of its proper divisors (21142462).

19999490 is a wasteful number, since it uses less digits than its factorization.

19999490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285721.

The product of its (nonzero) digits is 236196, while the sum is 50.

The square root of 19999490 is about 4472.0789349026. The cubic root of 19999490 is about 271.4394543849.

The spelling of 19999490 in words is "nineteen million, nine hundred ninety-nine thousand, four hundred ninety".