189402444 has 216 divisors, whose sum is σ = 624431808. Its totient is φ = 47839680.

The previous prime is 189402403. The next prime is 189402497. The reversal of 189402444 is 444204981.

189402444 = 1942² + 1943² + ... + 1990².

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 189402399 and 189402408.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 834259 + ... + 834485.

It is an arithmetic number, because the mean of its divisors is an integer number (2890888).

Almost surely, 2^189402444 is an apocalyptic number.

189402444 is a gapful number since it is divisible by the number (14) 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 189402444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (312215904).

189402444 is an abundant number, since it is smaller than the sum of its proper divisors (435029364).

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

189402444 is a wasteful number, since it uses less digits than its factorization.

189402444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305 (or 293 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The square root of 189402444 is about 13762.3560482935. The cubic root of 189402444 is about 574.2863928749.

The spelling of 189402444 in words is "one hundred eighty-nine million, four hundred two thousand, four hundred forty-four".