189769981 has 8 divisors (see below), whose sum is σ = 193381760. Its totient is φ = 186192432.

The previous prime is 189769969. The next prime is 189769991. The reversal of 189769981 is 189967981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 189769981 - 2¹⁵ = 189737213 is a prime.

It is a super-2 number, since 2×189769981² = 72025291377480722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189769991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2776 + ... + 19678.

It is an arithmetic number, because the mean of its divisors is an integer number (24172720).

Almost surely, 2^189769981 is an apocalyptic number.

It is an amenable number.

189769981 is a deficient number, since it is larger than the sum of its proper divisors (3611779).

189769981 is a wasteful number, since it uses less digits than its factorization.

189769981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17115.

The product of its digits is 1959552, while the sum is 58.

The square root of 189769981 is about 13775.7025592164. The cubic root of 189769981 is about 574.6576220098.

The spelling of 189769981 in words is "one hundred eighty-nine million, seven hundred sixty-nine thousand, nine hundred eighty-one".