189881378 has 16 divisors (see below), whose sum is σ = 292782336. Its totient is φ = 92307600.

The previous prime is 189881371. The next prime is 189881387. The reversal of 189881378 is 873188981.

It is a happy number.

It is a super-2 number, since 2×189881378² = 72109875422357768, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (189881371) 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, 14228 + ... + 24128.

It is an arithmetic number, because the mean of its divisors is an integer number (18298896).

Almost surely, 2^189881378 is an apocalyptic number.

189881378 is a deficient number, since it is larger than the sum of its proper divisors (102900958).

189881378 is a wasteful number, since it uses less digits than its factorization.

189881378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10169.

The product of its digits is 774144, while the sum is 53.

The square root of 189881378 is about 13779.7452080944. The cubic root of 189881378 is about 574.7700433967.

The spelling of 189881378 in words is "one hundred eighty-nine million, eight hundred eighty-one thousand, three hundred seventy-eight".