842977409 has 4 divisors (see below), whose sum is σ = 847686960. Its totient is φ = 838267860.

The previous prime is 842977403. The next prime is 842977417. The reversal of 842977409 is 904779248.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-842977409 is a prime.

It is a super-2 number, since 2×842977409² = 1421221824168706562, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (842977403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2354507 + ... + 2354864.

It is an arithmetic number, because the mean of its divisors is an integer number (211921740).

Almost surely, 2^842977409 is an apocalyptic number.

It is an amenable number.

842977409 is a deficient number, since it is larger than the sum of its proper divisors (4709551).

842977409 is a wasteful number, since it uses less digits than its factorization.

842977409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4709550.

The product of its (nonzero) digits is 1016064, while the sum is 50.

The square root of 842977409 is about 29034.0732416242. The cubic root of 842977409 is about 944.6522834453.

The spelling of 842977409 in words is "eight hundred forty-two million, nine hundred seventy-seven thousand, four hundred nine".