8400399999 has 16 divisors (see below), whose sum is σ = 11491200000. Its totient is φ = 5456614016.

The previous prime is 8400399949. The next prime is 8400400049. The reversal of 8400399999 is 9999930048.

It is an interprime number because it is at equal distance from previous prime (8400399949) and next prime (8400400049).

It is a cyclic number.

It is not a de Polignac number, because 8400399999 - 2⁸ = 8400399743 is a prime.

8400399999 is a modest number, since divided by 99999 gives 84003 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8400399929) 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, 189999 + ... + 230000.

It is an arithmetic number, because the mean of its divisors is an integer number (718200000).

Almost surely, 2^8400399999 is an apocalyptic number.

8400399999 is a deficient number, since it is larger than the sum of its proper divisors (3090800001).

8400399999 is a wasteful number, since it uses less digits than its factorization.

8400399999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420174.

The product of its (nonzero) digits is 5668704, while the sum is 60.

The square root of 8400399999 is about 91653.6960465861. The cubic root of 8400399999 is about 2032.8249795879.

The spelling of 8400399999 in words is "eight billion, four hundred million, three hundred ninety-nine thousand, nine hundred ninety-nine".