840294031 has 2 divisors, whose sum is σ = 840294032. Its totient is φ = 840294030.

The previous prime is 840293999. The next prime is 840294041. The reversal of 840294031 is 130492048.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 840294031 - 2⁵ = 840293999 is a prime.

It is a super-2 number, since 2×840294031² = 1412188117068457922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 840293984 and 840294002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840294041) 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 as a sum of consecutive naturals, namely, 420147015 + 420147016.

It is an arithmetic number, because the mean of its divisors is an integer number (420147016).

Almost surely, 2^840294031 is an apocalyptic number.

840294031 is a deficient number, since it is larger than the sum of its proper divisors (1).

840294031 is an equidigital number, since it uses as much as digits as its factorization.

840294031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 840294031 is about 28987.8255652265. The cubic root of 840294031 is about 943.6488743537.

The spelling of 840294031 in words is "eight hundred forty million, two hundred ninety-four thousand, thirty-one".