1977308539 has 4 divisors (see below), whose sum is σ = 2093620824. Its totient is φ = 1860996256.

The previous prime is 1977308521. The next prime is 1977308561. The reversal of 1977308539 is 9358037791.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9358037791 = 28019 ⋅333989.

It is not a de Polignac number, because 1977308539 - 2⁹ = 1977308027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1977308519) 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, 58156117 + ... + 58156150.

It is an arithmetic number, because the mean of its divisors is an integer number (523405206).

Almost surely, 2^1977308539 is an apocalyptic number.

1977308539 is a deficient number, since it is larger than the sum of its proper divisors (116312285).

1977308539 is a wasteful number, since it uses less digits than its factorization.

1977308539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116312284.

The product of its (nonzero) digits is 1428840, while the sum is 52.

The square root of 1977308539 is about 44466.9375941272. The cubic root of 1977308539 is about 1255.1380067596.

The spelling of 1977308539 in words is "one billion, nine hundred seventy-seven million, three hundred eight thousand, five hundred thirty-nine".