842864039 has 2 divisors, whose sum is σ = 842864040. Its totient is φ = 842864038.

The previous prime is 842863993. The next prime is 842864047. The reversal of 842864039 is 930468248.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-842864039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (842861039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421432019 + 421432020.

It is an arithmetic number, because the mean of its divisors is an integer number (421432020).

Almost surely, 2^842864039 is an apocalyptic number.

842864039 is a deficient number, since it is larger than the sum of its proper divisors (1).

842864039 is an equidigital number, since it uses as much as digits as its factorization.

842864039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 331776, while the sum is 44.

The square root of 842864039 is about 29032.1208147114. The cubic root of 842864039 is about 944.6099335438.

The spelling of 842864039 in words is "eight hundred forty-two million, eight hundred sixty-four thousand, thirty-nine".