1978936344 has 144 divisors (see below), whose sum is σ = 6801579720. Its totient is φ = 513999360.

The previous prime is 1978936339. The next prime is 1978936361. The reversal of 1978936344 is 4436398791.

It is a happy number.

1978936344 is a `hidden beast` number, since 197 + 89 + 36 + 344 = 666.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 13312 + ... + 64304.

Almost surely, 2^1978936344 is an apocalyptic number.

1978936344 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 1978936344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3400789860).

1978936344 is an abundant number, since it is smaller than the sum of its proper divisors (4822643376).

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

1978936344 is a wasteful number, since it uses less digits than its factorization.

1978936344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51030 (or 51016 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 54.

The square root of 1978936344 is about 44485.2373715146. The cubic root of 1978936344 is about 1255.4823400588.

The spelling of 1978936344 in words is "one billion, nine hundred seventy-eight million, nine hundred thirty-six thousand, three hundred forty-four".