840304490 has 8 divisors (see below), whose sum is σ = 1512548100. Its totient is φ = 336121792.

The previous prime is 840304489. The next prime is 840304511. The reversal of 840304490 is 94403048.

It can be written as a sum of positive squares in 2 ways, for example, as 787756489 + 52548001 = 28067^2 + 7249^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×840304490² = 1412223271828320200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 42015215 + ... + 42015234.

Almost surely, 2^840304490 is an apocalyptic number.

840304490 is a deficient number, since it is larger than the sum of its proper divisors (672243610).

840304490 is a wasteful number, since it uses less digits than its factorization.

840304490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84030456.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 840304490 is about 28988.0059679861. The cubic root of 840304490 is about 943.6527894843.

The spelling of 840304490 in words is "eight hundred forty million, three hundred four thousand, four hundred ninety".