19930999 has 12 divisors (see below), whose sum is σ = 22097152. Its totient is φ = 17962560.

The previous prime is 19930991. The next prime is 19931011. The reversal of 19930999 is 99903991.

It is not a de Polignac number, because 19930999 - 2³ = 19930991 is a prime.

It is a super-2 number, since 2×19930999² = 794489442276002, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19930991) 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, 14719 + ... + 16015.

Almost surely, 2^19930999 is an apocalyptic number.

19930999 is a deficient number, since it is larger than the sum of its proper divisors (2166153).

19930999 is a wasteful number, since it uses less digits than its factorization.

19930999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1446 (or 1435 counting only the distinct ones).

The product of its (nonzero) digits is 177147, while the sum is 49.

The square root of 19930999 is about 4464.4147432782. The cubic root of 19930999 is about 271.1292394278.

The spelling of 19930999 in words is "nineteen million, nine hundred thirty thousand, nine hundred ninety-nine".