840029490 has 24 divisors (see below), whose sum is σ = 2184076908. Its totient is φ = 224007840.

The previous prime is 840029461. The next prime is 840029497. The reversal of 840029490 is 94920048.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 839318841 + 710649 = 28971^2 + 843^2 .

It is not an unprimeable number, because it can be changed into a prime (840029497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4666741 + ... + 4666920.

Almost surely, 2^840029490 is an apocalyptic number.

840029490 is an abundant number, since it is smaller than the sum of its proper divisors (1344047418).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

840029490 is a wasteful number, since it uses less digits than its factorization.

840029490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9333674 (or 9333671 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 840029490 is about 28983.2622387474. The cubic root of 840029490 is about 943.5498375845.

The spelling of 840029490 in words is "eight hundred forty million, twenty-nine thousand, four hundred ninety".