189987433 has 4 divisors (see below), whose sum is σ = 190135888. Its totient is φ = 189838980.

The previous prime is 189987431. The next prime is 189987443. The reversal of 189987433 is 334789981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 189987433 - 2¹ = 189987431 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189987431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72291 + ... + 74872.

It is an arithmetic number, because the mean of its divisors is an integer number (47533972).

Almost surely, 2^189987433 is an apocalyptic number.

It is an amenable number.

189987433 is a deficient number, since it is larger than the sum of its proper divisors (148455).

189987433 is a wasteful number, since it uses less digits than its factorization.

189987433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148454.

The product of its digits is 1306368, while the sum is 52.

The square root of 189987433 is about 13783.5928915504. The cubic root of 189987433 is about 574.8770328098.

The spelling of 189987433 in words is "one hundred eighty-nine million, nine hundred eighty-seven thousand, four hundred thirty-three".