19493881 has 8 divisors (see below), whose sum is σ = 21385728. Its totient is φ = 17622000.

The previous prime is 19493869. The next prime is 19493893. The reversal of 19493881 is 18839491.

It is an interprime number because it is at equal distance from previous prime (19493869) and next prime (19493893).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-19493881 is a prime.

It is a super-2 number, since 2×19493881² = 760022792884322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19493821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2905 + ... + 6886.

It is an arithmetic number, because the mean of its divisors is an integer number (2673216).

Almost surely, 2^19493881 is an apocalyptic number.

19493881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

19493881 is a deficient number, since it is larger than the sum of its proper divisors (1891847).

19493881 is a wasteful number, since it uses less digits than its factorization.

19493881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9983.

The product of its digits is 62208, while the sum is 43.

The square root of 19493881 is about 4415.1875384858. The cubic root of 19493881 is about 269.1324739172.

The spelling of 19493881 in words is "nineteen million, four hundred ninety-three thousand, eight hundred eighty-one".