1979656380 has 144 divisors (see below), whose sum is σ = 6486209184. Its totient is φ = 485844480.

The previous prime is 1979656361. The next prime is 1979656387. The reversal of 1979656380 is 836569791.

1979656380 is a `hidden beast` number, since 1 + 9 + 79 + 6 + 563 + 8 + 0 = 666.

It is a super-3 number, since 3×1979656380³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1979656387) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 927915 + ... + 930045.

Almost surely, 2^1979656380 is an apocalyptic number.

1979656380 is a gapful number since it is divisible by the number (10) 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 1979656380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3243104592).

1979656380 is an abundant number, since it is smaller than the sum of its proper divisors (4506552804).

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

1979656380 is a wasteful number, since it uses less digits than its factorization.

1979656380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2556 (or 2551 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 54.

The square root of 1979656380 is about 44493.3296124262. The cubic root of 1979656380 is about 1255.6345906803.

It can be divided in two parts, 19796 and 56380, that added together give a square (76176 = 276²).

The spelling of 1979656380 in words is "one billion, nine hundred seventy-nine million, six hundred fifty-six thousand, three hundred eighty".