189898749 has 40 divisors (see below), whose sum is σ = 300835040. Its totient is φ = 119042784.

The previous prime is 189898733. The next prime is 189898759. The reversal of 189898749 is 947898981.

It is not a de Polignac number, because 189898749 - 2⁴ = 189898733 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189898729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 250479 + ... + 251235.

It is an arithmetic number, because the mean of its divisors is an integer number (7520876).

Almost surely, 2^189898749 is an apocalyptic number.

189898749 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

189898749 is a deficient number, since it is larger than the sum of its proper divisors (110936291).

189898749 is a wasteful number, since it uses less digits than its factorization.

189898749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 951 (or 942 counting only the distinct ones).

The product of its digits is 10450944, while the sum is 63.

The square root of 189898749 is about 13780.3755028664. The cubic root of 189898749 is about 574.7875701742.

The spelling of 189898749 in words is "one hundred eighty-nine million, eight hundred ninety-eight thousand, seven hundred forty-nine".