189978525 has 72 divisors (see below), whose sum is σ = 377788320. Its totient is φ = 90480000.

The previous prime is 189978521. The next prime is 189978527. The reversal of 189978525 is 525879981.

It is not a de Polignac number, because 189978525 - 2² = 189978521 is a prime.

It is a super-2 number, since 2×189978525² = 72183679922351250, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189978521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 145375 + ... + 146675.

It is an arithmetic number, because the mean of its divisors is an integer number (5247060).

Almost surely, 2^189978525 is an apocalyptic number.

189978525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

189978525 is a deficient number, since it is larger than the sum of its proper divisors (187809795).

189978525 is a wasteful number, since it uses less digits than its factorization.

189978525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1387 (or 1379 counting only the distinct ones).

The product of its digits is 1814400, while the sum is 54.

The square root of 189978525 is about 13783.2697499541. The cubic root of 189978525 is about 574.8680478565.

The spelling of 189978525 in words is "one hundred eighty-nine million, nine hundred seventy-eight thousand, five hundred twenty-five".