840269421 has 12 divisors (see below), whose sum is σ = 1285118172. Its totient is φ = 527227776.

The previous prime is 840269393. The next prime is 840269459. The reversal of 840269421 is 124962048.

It can be written as a sum of positive squares in 2 ways, for example, as 661004100 + 179265321 = 25710^2 + 13389^2 .

It is not a de Polignac number, because 840269421 - 2⁵ = 840269389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840269021) 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 in 11 ways as a sum of consecutive naturals, for example, 2745826 + ... + 2746131.

It is an arithmetic number, because the mean of its divisors is an integer number (107093181).

Almost surely, 2^840269421 is an apocalyptic number.

It is an amenable number.

840269421 is a deficient number, since it is larger than the sum of its proper divisors (444848751).

840269421 is a wasteful number, since it uses less digits than its factorization.

840269421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5491980 (or 5491977 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 840269421 is about 28987.4010735699. The cubic root of 840269421 is about 943.6396619334.

The spelling of 840269421 in words is "eight hundred forty million, two hundred sixty-nine thousand, four hundred twenty-one".