840226731 has 16 divisors (see below), whose sum is σ = 1170802944. Its totient is φ = 534975584.

The previous prime is 840226693. The next prime is 840226733. The reversal of 840226731 is 137622048.

It is not a de Polignac number, because 840226731 - 2¹⁰ = 840225707 is a prime.

It is a super-2 number, since 2×840226731² = 1411961918973892722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 840226692 and 840226701.

It is not an unprimeable number, because it can be changed into a prime (840226733) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37720 + ... + 55706.

It is an arithmetic number, because the mean of its divisors is an integer number (73175184).

Almost surely, 2^840226731 is an apocalyptic number.

840226731 is a deficient number, since it is larger than the sum of its proper divisors (330576213).

840226731 is a wasteful number, since it uses less digits than its factorization.

840226731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18690.

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 840226731 is about 28986.6647098282. The cubic root of 840226731 is about 943.6236810831.

Adding to 840226731 its reverse (137622048), we get a palindrome (977848779).

The spelling of 840226731 in words is "eight hundred forty million, two hundred twenty-six thousand, seven hundred thirty-one".