1977813043 has 4 divisors (see below), whose sum is σ = 1980490120. Its totient is φ = 1975135968.

The previous prime is 1977813029. The next prime is 1977813049. The reversal of 1977813043 is 3403187791.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1977813043 - 2²⁵ = 1944258611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1977813049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1337430 + ... + 1338907.

It is an arithmetic number, because the mean of its divisors is an integer number (495122530).

Almost surely, 2^1977813043 is an apocalyptic number.

1977813043 is a deficient number, since it is larger than the sum of its proper divisors (2677077).

1977813043 is an equidigital number, since it uses as much as digits as its factorization.

1977813043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2677076.

The product of its (nonzero) digits is 127008, while the sum is 43.

The square root of 1977813043 is about 44472.6100313440. The cubic root of 1977813043 is about 1255.2447458421.

The spelling of 1977813043 in words is "one billion, nine hundred seventy-seven million, eight hundred thirteen thousand, forty-three".