19870725 has 36 divisors (see below), whose sum is σ = 38223744. Its totient is φ = 9082080.

The previous prime is 19870693. The next prime is 19870727. The reversal of 19870725 is 52707891.

It is not a de Polignac number, because 19870725 - 2⁵ = 19870693 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19870727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 972 + ... + 6378.

Almost surely, 2^19870725 is an apocalyptic number.

19870725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19870725 is a deficient number, since it is larger than the sum of its proper divisors (18353019).

19870725 is a wasteful number, since it uses less digits than its factorization.

19870725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5434 (or 5422 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 39.

The square root of 19870725 is about 4457.6591390549. The cubic root of 19870725 is about 270.8556531244.

The spelling of 19870725 in words is "nineteen million, eight hundred seventy thousand, seven hundred twenty-five".