19894851 has 12 divisors (see below), whose sum is σ = 29084328. Its totient is φ = 13102944.

The previous prime is 19894837. The next prime is 19894867. The reversal of 19894851 is 15849891.

It is a de Polignac number, because none of the positive numbers 2^k-19894851 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19894797 and 19894806.

It is not an unprimeable number, because it can be changed into a prime (19894871) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12570 + ... + 14063.

It is an arithmetic number, because the mean of its divisors is an integer number (2423694).

Almost surely, 2^19894851 is an apocalyptic number.

19894851 is a deficient number, since it is larger than the sum of its proper divisors (9189477).

19894851 is a wasteful number, since it uses less digits than its factorization.

19894851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26722 (or 26719 counting only the distinct ones).

The product of its digits is 103680, while the sum is 45.

The square root of 19894851 is about 4460.3644469931. The cubic root of 19894851 is about 270.9652284014.

The spelling of 19894851 in words is "nineteen million, eight hundred ninety-four thousand, eight hundred fifty-one".