840498129 has 24 divisors (see below), whose sum is σ = 1251600480. Its totient is φ = 543264192.

The previous prime is 840498119. The next prime is 840498137. The reversal of 840498129 is 921894048.

It is not a de Polignac number, because 840498129 - 2⁸ = 840497873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (840498119) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27922 + ... + 49604.

It is an arithmetic number, because the mean of its divisors is an integer number (52150020).

Almost surely, 2^840498129 is an apocalyptic number.

It is an amenable number.

840498129 is a deficient number, since it is larger than the sum of its proper divisors (411102351).

840498129 is a wasteful number, since it uses less digits than its factorization.

840498129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21821 (or 21818 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The square root of 840498129 is about 28991.3457604162. The cubic root of 840498129 is about 943.7252687465.

The spelling of 840498129 in words is "eight hundred forty million, four hundred ninety-eight thousand, one hundred twenty-nine".