1978356441 has 8 divisors (see below), whose sum is σ = 2709100864. Its totient is φ = 1283258160.

The previous prime is 1978356433. The next prime is 1978356449. The reversal of 1978356441 is 1446538791.

It is an interprime number because it is at equal distance from previous prime (1978356433) and next prime (1978356449).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1978356441 - 2³ = 1978356433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1978356449) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 8911405 + ... + 8911626.

It is an arithmetic number, because the mean of its divisors is an integer number (338637608).

Almost surely, 2^1978356441 is an apocalyptic number.

It is an amenable number.

1978356441 is a deficient number, since it is larger than the sum of its proper divisors (730744423).

1978356441 is a wasteful number, since it uses less digits than its factorization.

1978356441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17823071.

The product of its digits is 725760, while the sum is 48.

The square root of 1978356441 is about 44478.7189676142. The cubic root of 1978356441 is about 1255.3596935160.

The spelling of 1978356441 in words is "one billion, nine hundred seventy-eight million, three hundred fifty-six thousand, four hundred forty-one".