1983956278 has 4 divisors (see below), whose sum is σ = 2975934420. Its totient is φ = 991978138.

The previous prime is 1983956251. The next prime is 1983956297. The reversal of 1983956278 is 8726593891.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×1983956278² = 7872165026031226568, which contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495989068 + ... + 495989071.

It is an arithmetic number, because the mean of its divisors is an integer number (743983605).

Almost surely, 2^1983956278 is an apocalyptic number.

1983956278 is a deficient number, since it is larger than the sum of its proper divisors (991978142).

1983956278 is an equidigital number, since it uses as much as digits as its factorization.

1983956278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991978141.

The product of its digits is 6531840, while the sum is 58.

The square root of 1983956278 is about 44541.6241059978. The cubic root of 1983956278 is about 1256.5430305497.

The spelling of 1983956278 in words is "one billion, nine hundred eighty-three million, nine hundred fifty-six thousand, two hundred seventy-eight".