19861672 has 16 divisors (see below), whose sum is σ = 37366560. Its totient is φ = 9897264.

The previous prime is 19861649. The next prime is 19861679. The reversal of 19861672 is 27616891.

It is not an unprimeable number, because it can be changed into a prime (19861679) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1588 + ... + 6499.

It is an arithmetic number, because the mean of its divisors is an integer number (2335410).

Almost surely, 2^19861672 is an apocalyptic number.

It is an amenable number.

19861672 is a deficient number, since it is larger than the sum of its proper divisors (17504888).

19861672 is a wasteful number, since it uses less digits than its factorization.

19861672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8400 (or 8396 counting only the distinct ones).

The product of its digits is 36288, while the sum is 40.

The square root of 19861672 is about 4456.6435800948. The cubic root of 19861672 is about 270.8145133957.

The spelling of 19861672 in words is "nineteen million, eight hundred sixty-one thousand, six hundred seventy-two".