189969408 has 88 divisors (see below), whose sum is σ = 562679360. Its totient is φ = 63313920.

The previous prime is 189969379. The next prime is 189969431. The reversal of 189969408 is 804969981.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24213 + ... + 31083.

Almost surely, 2^189969408 is an apocalyptic number.

189969408 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 189969408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (281339680).

189969408 is an abundant number, since it is smaller than the sum of its proper divisors (372709952).

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

189969408 is an equidigital number, since it uses as much as digits as its factorization.

189969408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6900 (or 6876 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 54.

The square root of 189969408 is about 13782.9390189466. The cubic root of 189969408 is about 574.8588518069.

The spelling of 189969408 in words is "one hundred eighty-nine million, nine hundred sixty-nine thousand, four hundred eight".