189396390 has 32 divisors (see below), whose sum is σ = 470227680. Its totient is φ = 48763904.

The previous prime is 189396379. The next prime is 189396397. The reversal of 189396390 is 93693981.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189396397) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107979 + ... + 109718.

It is an arithmetic number, because the mean of its divisors is an integer number (14694615).

Almost surely, 2^189396390 is an apocalyptic number.

189396390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

189396390 is an abundant number, since it is smaller than the sum of its proper divisors (280831290).

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

189396390 is a wasteful number, since it uses less digits than its factorization.

189396390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217736.

The product of its (nonzero) digits is 314928, while the sum is 48.

The square root of 189396390 is about 13762.1360987312. The cubic root of 189396390 is about 574.2802740400.

The spelling of 189396390 in words is "one hundred eighty-nine million, three hundred ninety-six thousand, three hundred ninety".