19990737 has 24 divisors (see below), whose sum is σ = 31617768. Its totient is φ = 12096000.

The previous prime is 19990721. The next prime is 19990741. The reversal of 19990737 is 73709991.

It can be written as a sum of positive squares in 4 ways, for example, as 197136 + 19793601 = 444^2 + 4449^2 .

It is not a de Polignac number, because 19990737 - 2⁴ = 19990721 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19990692 and 19990701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19990757) 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, 5737 + ... + 8537.

It is an arithmetic number, because the mean of its divisors is an integer number (1317407).

Almost surely, 2^19990737 is an apocalyptic number.

It is an amenable number.

19990737 is a deficient number, since it is larger than the sum of its proper divisors (11627031).

19990737 is a wasteful number, since it uses less digits than its factorization.

19990737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2881 (or 2878 counting only the distinct ones).

The product of its (nonzero) digits is 107163, while the sum is 45.

The square root of 19990737 is about 4471.1002001744. The cubic root of 19990737 is about 271.3998491043.

The spelling of 19990737 in words is "nineteen million, nine hundred ninety thousand, seven hundred thirty-seven".