1977857045 has 8 divisors (see below), whose sum is σ = 2373892920. Its totient is φ = 1581976000.

The previous prime is 1977857039. The next prime is 1977857093. The reversal of 1977857045 is 5407587791.

It can be written as a sum of positive squares in 4 ways, for example, as 761870404 + 1215986641 = 27602^2 + 34871^2 .

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

It is not a de Polignac number, because 1977857045 - 2⁴ = 1977857029 is a prime.

It is a super-2 number, since 2×1977857045² = 7823836980912264050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8450 + ... + 63459.

It is an arithmetic number, because the mean of its divisors is an integer number (296736615).

Almost surely, 2^1977857045 is an apocalyptic number.

It is an amenable number.

1977857045 is a deficient number, since it is larger than the sum of its proper divisors (396035875).

1977857045 is an equidigital number, since it uses as much as digits as its factorization.

1977857045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77415.

The product of its (nonzero) digits is 2469600, while the sum is 53.

The square root of 1977857045 is about 44473.1047375827. The cubic root of 1977857045 is about 1255.2540545867.

The spelling of 1977857045 in words is "one billion, nine hundred seventy-seven million, eight hundred fifty-seven thousand, forty-five".