189983731 has 6 divisors (see below), whose sum is σ = 221001540. Its totient is φ = 162843156.

The previous prime is 189983719. The next prime is 189983753. The reversal of 189983731 is 137389981.

It is not a de Polignac number, because 189983731 - 2¹⁷ = 189852659 is a prime.

It is a super-2 number, since 2×189983731² = 72187636089360722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49), and also a Moran number because the ratio is a prime number: 3877219 = 189983731 / (1 + 8 + 9 + 9 + 8 + 3 + 7 + 3 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189980731) 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, 1938561 + ... + 1938658.

It is an arithmetic number, because the mean of its divisors is an integer number (36833590).

Almost surely, 2^189983731 is an apocalyptic number.

189983731 is a deficient number, since it is larger than the sum of its proper divisors (31017809).

189983731 is an equidigital number, since it uses as much as digits as its factorization.

189983731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3877233 (or 3877226 counting only the distinct ones).

The product of its digits is 326592, while the sum is 49.

The square root of 189983731 is about 13783.4586008012. The cubic root of 189983731 is about 574.8732988636.

The spelling of 189983731 in words is "one hundred eighty-nine million, nine hundred eighty-three thousand, seven hundred thirty-one".