400099 has 8 divisors (see below), whose sum is σ = 465248. Its totient is φ = 336960.

The previous prime is 400093. The next prime is 400109. The reversal of 400099 is 990004.

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

It is a cyclic number.

It is not a de Polignac number, because 400099 - 2⁵ = 400067 is a prime.

400099 is a modest number, since divided by 99 gives 40 as remainder.

It is not an unprimeable number, because it can be changed into a prime (400093) 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, 42 + ... + 895.

It is an arithmetic number, because the mean of its divisors is an integer number (58156).

2⁴⁰⁰⁰⁹⁹ is an apocalyptic number.

400099 is a deficient number, since it is larger than the sum of its proper divisors (65149).

400099 is an equidigital number, since it uses as much as digits as its factorization.

400099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1005.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 400099 is about 632.5337935636. The cubic root of 400099 is about 73.6867081234.

The spelling of 400099 in words is "four hundred thousand, ninety-nine".