19940999 has 8 divisors (see below), whose sum is σ = 21734832. Its totient is φ = 18184320.

The previous prime is 19940981. The next prime is 19941001. The reversal of 19940999 is 99904991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19940999 is a prime.

It is a super-2 number, since 2×19940999² = 795286882236002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19940699) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8162 + ... + 10319.

It is an arithmetic number, because the mean of its divisors is an integer number (2716854).

Almost surely, 2^19940999 is an apocalyptic number.

19940999 is a deficient number, since it is larger than the sum of its proper divisors (1793833).

19940999 is a wasteful number, since it uses less digits than its factorization.

19940999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18577.

The product of its (nonzero) digits is 236196, while the sum is 50.

The square root of 19940999 is about 4465.5345704630. The cubic root of 19940999 is about 271.1745764941.

The spelling of 19940999 in words is "nineteen million, nine hundred forty thousand, nine hundred ninety-nine".