19975725 has 72 divisors (see below), whose sum is σ = 44645952. Its totient is φ = 8294400.

The previous prime is 19975721. The next prime is 19975727. The reversal of 19975725 is 52757991.

It is not a de Polignac number, because 19975725 - 2² = 19975721 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19975721) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 16749 + ... + 17901.

Almost surely, 2^19975725 is an apocalyptic number.

19975725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19975725 is an abundant number, since it is smaller than the sum of its proper divisors (24670227).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19975725 is a wasteful number, since it uses less digits than its factorization.

19975725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1187 (or 1179 counting only the distinct ones).

The product of its digits is 198450, while the sum is 45.

The square root of 19975725 is about 4469.4211034540. The cubic root of 19975725 is about 271.3318963851.

The spelling of 19975725 in words is "nineteen million, nine hundred seventy-five thousand, seven hundred twenty-five".