840274231 has 2 divisors, whose sum is σ = 840274232. Its totient is φ = 840274230.

The previous prime is 840274163. The next prime is 840274241. The reversal of 840274231 is 132472048.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 840274231 - 2²¹ = 838177079 is a prime.

It is a super-2 number, since 2×840274231² = 1412121566565282722, 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 = 840274193 and 840274202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840274241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420137115 + 420137116.

It is an arithmetic number, because the mean of its divisors is an integer number (420137116).

Almost surely, 2^840274231 is an apocalyptic number.

840274231 is a deficient number, since it is larger than the sum of its proper divisors (1).

840274231 is an equidigital number, since it uses as much as digits as its factorization.

840274231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 840274231 is about 28987.4840405303. The cubic root of 840274231 is about 943.6414625059.

The spelling of 840274231 in words is "eight hundred forty million, two hundred seventy-four thousand, two hundred thirty-one".