19493990 has 16 divisors (see below), whose sum is σ = 35147952. Its totient is φ = 7784544.

The previous prime is 19493989. The next prime is 19494001. The reversal of 19493990 is 9939491.

It is a super-2 number, since 2×19493990² = 760031292240200, which contains 22 as substring.

It is a congruent number.

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, 6632 + ... + 9108.

It is an arithmetic number, because the mean of its divisors is an integer number (2196747).

Almost surely, 2^19493990 is an apocalyptic number.

19493990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19493990 is a deficient number, since it is larger than the sum of its proper divisors (15653962).

19493990 is a wasteful number, since it uses less digits than its factorization.

19493990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3271.

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

The square root of 19493990 is about 4415.1998822250. The cubic root of 19493990 is about 269.1329755341.

The spelling of 19493990 in words is "nineteen million, four hundred ninety-three thousand, nine hundred ninety".