189439240 has 32 divisors (see below), whose sum is σ = 427414680. Its totient is φ = 75566592.

The previous prime is 189439213. The next prime is 189439267. The reversal of 189439240 is 42934981.

It is an interprime number because it is at equal distance from previous prime (189439213) and next prime (189439267).

It can be written as a sum of positive squares in 4 ways, for example, as 129004164 + 60435076 = 11358^2 + 7774^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 189439193 and 189439202.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8572 + ... + 21268.

Almost surely, 2^189439240 is an apocalyptic number.

189439240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

189439240 is an abundant number, since it is smaller than the sum of its proper divisors (237975440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

189439240 is a wasteful number, since it uses less digits than its factorization.

189439240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13081 (or 13077 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 189439240 is about 13763.6928184263. The cubic root of 189439240 is about 574.3235801350.

The spelling of 189439240 in words is "one hundred eighty-nine million, four hundred thirty-nine thousand, two hundred forty".