189897390 has 48 divisors (see below), whose sum is σ = 504249408. Its totient is φ = 49560768.

The previous prime is 189897373. The next prime is 189897391. The reversal of 189897390 is 93798981.

It is a super-2 number, since 2×189897390² = 72122037457624200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189897391) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18217 + ... + 26676.

It is an arithmetic number, because the mean of its divisors is an integer number (10505196).

Almost surely, 2^189897390 is an apocalyptic number.

189897390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

189897390 is an abundant number, since it is smaller than the sum of its proper divisors (314352018).

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

189897390 is a wasteful number, since it uses less digits than its factorization.

189897390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44953 (or 44950 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 54.

The square root of 189897390 is about 13780.3261935268. The cubic root of 189897390 is about 574.7861990256.

The spelling of 189897390 in words is "one hundred eighty-nine million, eight hundred ninety-seven thousand, three hundred ninety".