189451945 has 32 divisors (see below), whose sum is σ = 246343680. Its totient is φ = 139426560.

The previous prime is 189451931. The next prime is 189451949. The reversal of 189451945 is 549154981.

It is a happy number.

It is not a de Polignac number, because 189451945 - 2⁷ = 189451817 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 189451895 and 189451904.

It is not an unprimeable number, because it can be changed into a prime (189451949) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 961587 + ... + 961783.

It is an arithmetic number, because the mean of its divisors is an integer number (7698240).

Almost surely, 2^189451945 is an apocalyptic number.

It is an amenable number.

189451945 is a deficient number, since it is larger than the sum of its proper divisors (56891735).

189451945 is a wasteful number, since it uses less digits than its factorization.

189451945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465.

The product of its digits is 259200, while the sum is 46.

The square root of 189451945 is about 13764.1543510671. The cubic root of 189451945 is about 574.3364191117.

The spelling of 189451945 in words is "one hundred eighty-nine million, four hundred fifty-one thousand, nine hundred forty-five".