19725489 has 18 divisors (see below), whose sum is σ = 33144930. Its totient is φ = 11271456.

The previous prime is 19725479. The next prime is 19725527. The reversal of 19725489 is 98452791.

It can be written as a sum of positive squares in only one way, i.e., 18533025 + 1192464 = 4305^2 + 1092^2 .

It is not a de Polignac number, because 19725489 - 2⁴ = 19725473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19725449) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 21924 + ... + 22805.

It is an arithmetic number, because the mean of its divisors is an integer number (1841385).

Almost surely, 2^19725489 is an apocalyptic number.

It is an amenable number.

19725489 is a deficient number, since it is larger than the sum of its proper divisors (13419441).

19725489 is a wasteful number, since it uses less digits than its factorization.

19725489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44749 (or 44739 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 19725489 is about 4441.3386495515. The cubic root of 19725489 is about 270.1941402078.

The spelling of 19725489 in words is "nineteen million, seven hundred twenty-five thousand, four hundred eighty-nine".