19907998 has 24 divisors (see below), whose sum is σ = 33531624. Its totient is φ = 8791200.

The previous prime is 19907981. The next prime is 19907999. The reversal of 19907998 is 89970991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19907999) 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, 29788 + ... + 30448.

It is an arithmetic number, because the mean of its divisors is an integer number (1397151).

Almost surely, 2^19907998 is an apocalyptic number.

19907998 is a deficient number, since it is larger than the sum of its proper divisors (13623626).

19907998 is a wasteful number, since it uses less digits than its factorization.

19907998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 748 (or 711 counting only the distinct ones).

The product of its (nonzero) digits is 367416, while the sum is 52.

The square root of 19907998 is about 4461.8379620959. The cubic root of 19907998 is about 271.0249020567.

The spelling of 19907998 in words is "nineteen million, nine hundred seven thousand, nine hundred ninety-eight".