19980399 has 16 divisors (see below), whose sum is σ = 28698624. Its totient is φ = 12328800.

The previous prime is 19980397. The next prime is 19980403. The reversal of 19980399 is 99308991.

It is not a de Polignac number, because 19980399 - 2¹ = 19980397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19980397) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2532 + ... + 6809.

It is an arithmetic number, because the mean of its divisors is an integer number (1793664).

Almost surely, 2^19980399 is an apocalyptic number.

19980399 is a deficient number, since it is larger than the sum of its proper divisors (8718225).

19980399 is a wasteful number, since it uses less digits than its factorization.

19980399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9398.

The product of its (nonzero) digits is 157464, while the sum is 48.

The square root of 19980399 is about 4469.9439593803. The cubic root of 19980399 is about 271.3530571754.

The spelling of 19980399 in words is "nineteen million, nine hundred eighty thousand, three hundred ninety-nine".