8400999 has 4 divisors (see below), whose sum is σ = 11201336. Its totient is φ = 5600664.

The previous prime is 8400979. The next prime is 8401013. The reversal of 8400999 is 9990048.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 8400999 - 2⁵ = 8400967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8400919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1400164 + ... + 1400169.

It is an arithmetic number, because the mean of its divisors is an integer number (2800334).

Almost surely, 2^8400999 is an apocalyptic number.

8400999 is a deficient number, since it is larger than the sum of its proper divisors (2800337).

8400999 is a wasteful number, since it uses less digits than its factorization.

8400999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2800336.

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 8400999 is about 2898.4476879875. The cubic root of 8400999 is about 203.2873296146.

The spelling of 8400999 in words is "eight million, four hundred thousand, nine hundred ninety-nine".