1982216377 has 8 divisors (see below), whose sum is σ = 2047286664. Its totient is φ = 1918171008.

The previous prime is 1982216317. The next prime is 1982216389. The reversal of 1982216377 is 7736122891.

It can be written as a sum of positive squares in 4 ways, for example, as 139145616 + 1843070761 = 11796^2 + 42931^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1982216377 is a prime.

It is a super-2 number, since 2×1982216377² = 7858363530494012258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1982216317) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 252298 + ... + 260035.

It is an arithmetic number, because the mean of its divisors is an integer number (255910833).

Almost surely, 2^1982216377 is an apocalyptic number.

It is an amenable number.

1982216377 is a deficient number, since it is larger than the sum of its proper divisors (65070287).

1982216377 is an equidigital number, since it uses as much as digits as its factorization.

1982216377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512459.

The product of its digits is 254016, while the sum is 46.

The square root of 1982216377 is about 44522.0886414822. The cubic root of 1982216377 is about 1256.1755997554.

The spelling of 1982216377 in words is "one billion, nine hundred eighty-two million, two hundred sixteen thousand, three hundred seventy-seven".