7977937449 has 4 divisors (see below), whose sum is σ = 10637249936. Its totient is φ = 5318624964.

The previous prime is 7977937433. The next prime is 7977937511. The reversal of 7977937449 is 9447397797.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 7977937449 - 2⁴ = 7977937433 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7977937449.

It is not an unprimeable number, because it can be changed into a prime (7977932449) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1329656239 + ... + 1329656244.

It is an arithmetic number, because the mean of its divisors is an integer number (2659312484).

Almost surely, 2^7977937449 is an apocalyptic number.

It is an amenable number.

7977937449 is a deficient number, since it is larger than the sum of its proper divisors (2659312487).

7977937449 is a wasteful number, since it uses less digits than its factorization.

7977937449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2659312486.

The product of its digits is 84015792, while the sum is 66.

The square root of 7977937449 is about 89319.3005402528. The cubic root of 7977937449 is about 1998.1597613635.

The spelling of 7977937449 in words is "seven billion, nine hundred seventy-seven million, nine hundred thirty-seven thousand, four hundred forty-nine".