1981977434 has 8 divisors (see below), whose sum is σ = 2973155220. Its totient is φ = 990925696.

The previous prime is 1981977407. The next prime is 1981977443. The reversal of 1981977434 is 4347791891.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1594005625 + 387971809 = 39925^2 + 19697^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43772 + ... + 76680.

Almost surely, 2^1981977434 is an apocalyptic number.

1981977434 is a deficient number, since it is larger than the sum of its proper divisors (991177786).

1981977434 is a wasteful number, since it uses less digits than its factorization.

1981977434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63024.

The product of its digits is 1524096, while the sum is 53.

The square root of 1981977434 is about 44519.4051397815. The cubic root of 1981977434 is about 1256.1251231894.

The spelling of 1981977434 in words is "one billion, nine hundred eighty-one million, nine hundred seventy-seven thousand, four hundred thirty-four".