1978694484 has 24 divisors (see below), whose sum is σ = 4972104480. Its totient is φ = 608829024.

The previous prime is 1978694467. The next prime is 1978694491. The reversal of 1978694484 is 4844968791.

It is a super-2 number, since 2×1978694484² = 7830463722024052512, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6341814 + ... + 6342125.

It is an arithmetic number, because the mean of its divisors is an integer number (207171020).

Almost surely, 2^1978694484 is an apocalyptic number.

It is an amenable number.

1978694484 is an abundant number, since it is smaller than the sum of its proper divisors (2993409996).

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

1978694484 is a wasteful number, since it uses less digits than its factorization.

1978694484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12683959 (or 12683957 counting only the distinct ones).

The product of its digits is 13934592, while the sum is 60.

The square root of 1978694484 is about 44482.5188585359. The cubic root of 1978694484 is about 1255.4311908087.

The spelling of 1978694484 in words is "one billion, nine hundred seventy-eight million, six hundred ninety-four thousand, four hundred eighty-four".