19681914 has 32 divisors (see below), whose sum is σ = 45190656. Its totient is φ = 5598000.

The previous prime is 19681913. The next prime is 19681919. The reversal of 19681914 is 41918691.

It is not an unprimeable number, because it can be changed into a prime (19681913) 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, 9609 + ... + 11475.

It is an arithmetic number, because the mean of its divisors is an integer number (1412208).

Almost surely, 2^19681914 is an apocalyptic number.

19681914 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

19681914 is an abundant number, since it is smaller than the sum of its proper divisors (25508742).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19681914 is a wasteful number, since it uses less digits than its factorization.

19681914 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2130.

The product of its digits is 15552, while the sum is 39.

The square root of 19681914 is about 4436.4303217790. The cubic root of 19681914 is about 269.9950342022.

The spelling of 19681914 in words is "nineteen million, six hundred eighty-one thousand, nine hundred fourteen".