19993490 has 16 divisors (see below), whose sum is σ = 39260160. Its totient is φ = 7270320.

The previous prime is 19993489. The next prime is 19993517. The reversal of 19993490 is 9439991.

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, 90770 + ... + 90989.

It is an arithmetic number, because the mean of its divisors is an integer number (2453760).

Almost surely, 2^19993490 is an apocalyptic number.

19993490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19993490 is a deficient number, since it is larger than the sum of its proper divisors (19266670).

19993490 is a wasteful number, since it uses less digits than its factorization.

19993490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181777.

The product of its (nonzero) digits is 78732, while the sum is 44.

The square root of 19993490 is about 4471.4080556353. The cubic root of 19993490 is about 271.4123070323.

The spelling of 19993490 in words is "nineteen million, nine hundred ninety-three thousand, four hundred ninety".