840281631 has 16 divisors (see below), whose sum is σ = 1347820800. Its totient is φ = 454889088.

The previous prime is 840281621. The next prime is 840281653. The reversal of 840281631 is 136182048.

It is not a de Polignac number, because 840281631 - 2¹⁴ = 840265247 is a prime.

It is a super-2 number, since 2×840281631² = 1412146438792040322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 840281592 and 840281601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840281621) 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, 1052586 + ... + 1053383.

It is an arithmetic number, because the mean of its divisors is an integer number (84238800).

Almost surely, 2^840281631 is an apocalyptic number.

840281631 is a deficient number, since it is larger than the sum of its proper divisors (507539169).

840281631 is a wasteful number, since it uses less digits than its factorization.

840281631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2105998.

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 840281631 is about 28987.6116815442. The cubic root of 840281631 is about 943.6442326041.

The spelling of 840281631 in words is "eight hundred forty million, two hundred eighty-one thousand, six hundred thirty-one".