8400399591 has 16 divisors (see below), whose sum is σ = 11365992704. Its totient is φ = 5517699264.

The previous prime is 8400399589. The next prime is 8400399593. The reversal of 8400399591 is 1959930048.

It is an interprime number because it is at equal distance from previous prime (8400399589) and next prime (8400399593).

It is not a de Polignac number, because 8400399591 - 2¹ = 8400399589 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8400399591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8400399593) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 191940 + ... + 231606.

It is an arithmetic number, because the mean of its divisors is an integer number (710374544).

Almost surely, 2^8400399591 is an apocalyptic number.

8400399591 is a deficient number, since it is larger than the sum of its proper divisors (2965593113).

8400399591 is a wasteful number, since it uses less digits than its factorization.

8400399591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40710.

The product of its (nonzero) digits is 349920, while the sum is 48.

The square root of 8400399591 is about 91653.6938208166. The cubic root of 8400399591 is about 2032.8249466771.

The spelling of 8400399591 in words is "eight billion, four hundred million, three hundred ninety-nine thousand, five hundred ninety-one".