1978876417 has 32 divisors (see below), whose sum is σ = 2360960000. Its totient is φ = 1657454400.

The previous prime is 1978876411. The next prime is 1978876433. The reversal of 1978876417 is 7146788791.

It is not a de Polignac number, because 1978876417 - 2³ = 1978876409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1978876411) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5669959 + ... + 5670307.

It is an arithmetic number, because the mean of its divisors is an integer number (73780000).

Almost surely, 2^1978876417 is an apocalyptic number.

It is an amenable number.

1978876417 is a deficient number, since it is larger than the sum of its proper divisors (382083583).

1978876417 is an equidigital number, since it uses as much as digits as its factorization.

1978876417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702 (or 688 counting only the distinct ones).

The product of its digits is 4741632, while the sum is 58.

The square root of 1978876417 is about 44484.5638058866. The cubic root of 1978876417 is about 1255.4696669124.

It can be divided in two parts, 197887 and 6417, that added together give a square (204304 = 452²).

The spelling of 1978876417 in words is "one billion, nine hundred seventy-eight million, eight hundred seventy-six thousand, four hundred seventeen".