1979043156 has 18 divisors (see below), whose sum is σ = 5002581402. Its totient is φ = 659681040.

The previous prime is 1979043139. The next prime is 1979043163. The reversal of 1979043156 is 6513409791.

It can be written as a sum of positive squares in only one way, i.e., 1047816900 + 931226256 = 32370^2 + 30516^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×1979043156² = 7833223626620880672, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27486675 + ... + 27486746.

It is an arithmetic number, because the mean of its divisors is an integer number (277921189).

Almost surely, 2^1979043156 is an apocalyptic number.

It is an amenable number.

1979043156 is an abundant number, since it is smaller than the sum of its proper divisors (3023538246).

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

1979043156 is a wasteful number, since it uses less digits than its factorization.

1979043156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54973431 (or 54973426 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 45.

The square root of 1979043156 is about 44486.4378884172. The cubic root of 1979043156 is about 1255.5049276418.

The spelling of 1979043156 in words is "one billion, nine hundred seventy-nine million, forty-three thousand, one hundred fifty-six".