840412429 has 4 divisors (see below), whose sum is σ = 841118076. Its totient is φ = 839706784.

The previous prime is 840412403. The next prime is 840412439. The reversal of 840412429 is 924214048.

840412429 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 686702025 + 153710404 = 26205^2 + 12398^2 .

It is a cyclic number.

It is not a de Polignac number, because 840412429 - 2¹⁷ = 840281357 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 840412394 and 840412403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840412439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 351034 + ... + 353419.

It is an arithmetic number, because the mean of its divisors is an integer number (210279519).

Almost surely, 2^840412429 is an apocalyptic number.

It is an amenable number.

840412429 is a deficient number, since it is larger than the sum of its proper divisors (705647).

840412429 is a wasteful number, since it uses less digits than its factorization.

840412429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 705646.

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 840412429 is about 28989.8676954553. The cubic root of 840412429 is about 943.6931925282.

The spelling of 840412429 in words is "eight hundred forty million, four hundred twelve thousand, four hundred twenty-nine".