1999178244 has 180 divisors, whose sum is σ = 5979742860. Its totient is φ = 563068800.

The previous prime is 1999178221. The next prime is 1999178267. The reversal of 1999178244 is 4428719991.

It is an interprime number because it is at equal distance from previous prime (1999178221) and next prime (1999178267).

It can be written as a sum of positive squares in 2 ways, for example, as 1893294144 + 105884100 = 43512^2 + 10290^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 8729922 + ... + 8730150.

Almost surely, 2^1999178244 is an apocalyptic number.

1999178244 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 1999178244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2989871430).

1999178244 is an abundant number, since it is smaller than the sum of its proper divisors (3980564616).

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

1999178244 is a wasteful number, since it uses less digits than its factorization.

1999178244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368 (or 342 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 54.

The square root of 1999178244 is about 44712.1710946807. The cubic root of 1999178244 is about 1259.7484683090.

The spelling of 1999178244 in words is "one billion, nine hundred ninety-nine million, one hundred seventy-eight thousand, two hundred forty-four".