840028399 has 8 divisors (see below), whose sum is σ = 1010560640. Its totient is φ = 682128216.

The previous prime is 840028381. The next prime is 840028411. The reversal of 840028399 is 993820048.

It is a happy number.

840028399 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 840028399 - 2⁵ = 840028367 is a prime.

It is a super-2 number, since 2×840028399² = 1411295422253006402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840028339) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3157869 + ... + 3158134.

It is an arithmetic number, because the mean of its divisors is an integer number (126320080).

Almost surely, 2^840028399 is an apocalyptic number.

840028399 is a deficient number, since it is larger than the sum of its proper divisors (170532241).

840028399 is a wasteful number, since it uses less digits than its factorization.

840028399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6316029.

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 840028399 is about 28983.2434175335. The cubic root of 840028399 is about 943.5494291015.

The spelling of 840028399 in words is "eight hundred forty million, twenty-eight thousand, three hundred ninety-nine".