1978484956 has 36 divisors (see below), whose sum is σ = 4264556688. Its totient is φ = 798043008.

The previous prime is 1978484941. The next prime is 1978484957. The reversal of 1978484956 is 6594848791.

It is a super-2 number, since 2×1978484956² = 7828805442236643872, which contains 22 as substring.

It is a Smith number, since the sum of its digits (61) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1978484894 and 1978484903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978484957) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 293560 + ... + 300223.

It is an arithmetic number, because the mean of its divisors is an integer number (118459908).

Almost surely, 2^1978484956 is an apocalyptic number.

It is an amenable number.

1978484956 is an abundant number, since it is smaller than the sum of its proper divisors (2286071732).

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

1978484956 is a wasteful number, since it uses less digits than its factorization.

1978484956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593818 (or 593809 counting only the distinct ones).

The product of its digits is 17418240, while the sum is 61.

The square root of 1978484956 is about 44480.1636237998. The cubic root of 1978484956 is about 1255.3868758535.

The spelling of 1978484956 in words is "one billion, nine hundred seventy-eight million, four hundred eighty-four thousand, nine hundred fifty-six".