19902125 has 16 divisors (see below), whose sum is σ = 25075440. Its totient is φ = 15769600.

The previous prime is 19902119. The next prime is 19902131. The reversal of 19902125 is 52120991.

It is an interprime number because it is at equal distance from previous prime (19902119) and next prime (19902131).

It can be written as a sum of positive squares in 8 ways, for example, as 18130564 + 1771561 = 4258^2 + 1331^2 .

It is not a de Polignac number, because 19902125 - 2⁴ = 19902109 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13421 + ... + 14829.

It is an arithmetic number, because the mean of its divisors is an integer number (1567215).

Almost surely, 2^19902125 is an apocalyptic number.

It is an amenable number.

19902125 is a deficient number, since it is larger than the sum of its proper divisors (5173315).

19902125 is a wasteful number, since it uses less digits than its factorization.

19902125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1537 (or 1527 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 19902125 is about 4461.1797766958. The cubic root of 19902125 is about 270.9982480154.

The spelling of 19902125 in words is "nineteen million, nine hundred two thousand, one hundred twenty-five".