9977839 has 2 divisors, whose sum is σ = 9977840. Its totient is φ = 9977838.

The previous prime is 9977819. The next prime is 9977867. The reversal of 9977839 is 9387799.

It is a weak prime.

It is an emirp because it is prime and its reverse (9387799) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9977839 - 2⁹ = 9977327 is a prime.

It is a super-2 number, since 2×9977839² = 199114542219842, which contains 22 as substring.

9977839 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9977809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4988919 + 4988920.

It is an arithmetic number, because the mean of its divisors is an integer number (4988920).

Almost surely, 2^9977839 is an apocalyptic number.

9977839 is a deficient number, since it is larger than the sum of its proper divisors (1).

9977839 is an equidigital number, since it uses as much as digits as its factorization.

9977839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 857304, while the sum is 52.

The square root of 9977839 is about 3158.7717549706. The cubic root of 9977839 is about 215.2842032050.

It can be divided in two parts, 9977 and 839, that added together give a square (10816 = 104²).

The spelling of 9977839 in words is "nine million, nine hundred seventy-seven thousand, eight hundred thirty-nine".