19897983 has 24 divisors (see below), whose sum is σ = 33111936. Its totient is φ = 11278800.

The previous prime is 19897961. The next prime is 19897987. The reversal of 19897983 is 38979891.

It is not a de Polignac number, because 19897983 - 2⁵ = 19897951 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19897987) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7048 + ... + 9458.

It is an arithmetic number, because the mean of its divisors is an integer number (1379664).

Almost surely, 2^19897983 is an apocalyptic number.

19897983 is a deficient number, since it is larger than the sum of its proper divisors (13213953).

19897983 is a wasteful number, since it uses less digits than its factorization.

19897983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2555 (or 2552 counting only the distinct ones).

The product of its digits is 979776, while the sum is 54.

The square root of 19897983 is about 4460.7155255631. The cubic root of 19897983 is about 270.9794467966.

The spelling of 19897983 in words is "nineteen million, eight hundred ninety-seven thousand, nine hundred eighty-three".