189415906 has 4 divisors (see below), whose sum is σ = 284123862. Its totient is φ = 94707952.

The previous prime is 189415873. The next prime is 189415927. The reversal of 189415906 is 609514981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 609514981 = 43 ⋅14174767.

It can be written as a sum of positive squares in only one way, i.e., 174477681 + 14938225 = 13209^2 + 3865^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 47353975 + ... + 47353978.

Almost surely, 2^189415906 is an apocalyptic number.

189415906 is a deficient number, since it is larger than the sum of its proper divisors (94707956).

189415906 is an equidigital number, since it uses as much as digits as its factorization.

189415906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94707955.

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 189415906 is about 13762.8451273710. The cubic root of 189415906 is about 574.2999985780.

The spelling of 189415906 in words is "one hundred eighty-nine million, four hundred fifteen thousand, nine hundred six".