189897550 has 12 divisors (see below), whose sum is σ = 353209536. Its totient is φ = 75959000.

The previous prime is 189897479. The next prime is 189897553. The reversal of 189897550 is 55798981.

It is a super-2 number, since 2×189897550² = 72122158992005000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189897553) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1898926 + ... + 1899025.

It is an arithmetic number, because the mean of its divisors is an integer number (29434128).

Almost surely, 2^189897550 is an apocalyptic number.

189897550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

189897550 is a deficient number, since it is larger than the sum of its proper divisors (163311986).

189897550 is a wasteful number, since it uses less digits than its factorization.

189897550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3797963 (or 3797958 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 52.

The square root of 189897550 is about 13780.3319989034. The cubic root of 189897550 is about 574.7863604563.

The spelling of 189897550 in words is "one hundred eighty-nine million, eight hundred ninety-seven thousand, five hundred fifty".