1974878213 has 24 divisors (see below), whose sum is σ = 2520758880. Its totient is φ = 1529898720.

The previous prime is 1974878203. The next prime is 1974878239. The reversal of 1974878213 is 3128784791.

It is a happy number.

It is not a de Polignac number, because 1974878213 - 2⁴ = 1974878197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1974878203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 82658 + ... + 103836.

It is an arithmetic number, because the mean of its divisors is an integer number (105031620).

Almost surely, 2^1974878213 is an apocalyptic number.

It is an amenable number.

1974878213 is a deficient number, since it is larger than the sum of its proper divisors (545880667).

1974878213 is a wasteful number, since it uses less digits than its factorization.

1974878213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21377 (or 21370 counting only the distinct ones).

The product of its digits is 677376, while the sum is 50.

The square root of 1974878213 is about 44439.6018546521. The cubic root of 1974878213 is about 1254.6235624902.

The spelling of 1974878213 in words is "one billion, nine hundred seventy-four million, eight hundred seventy-eight thousand, two hundred thirteen".