400599 has 16 divisors (see below), whose sum is σ = 611040. Its totient is φ = 259200.

The previous prime is 400597. The next prime is 400601. The reversal of 400599 is 995004.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (400597) and next prime (400601).

It is not a de Polignac number, because 400599 - 2¹ = 400597 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 799 + ... + 1199.

It is an arithmetic number, because the mean of its divisors is an integer number (38190).

2⁴⁰⁰⁵⁹⁹ is an apocalyptic number.

400599 is a deficient number, since it is larger than the sum of its proper divisors (210441).

400599 is a wasteful number, since it uses less digits than its factorization.

400599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447 (or 441 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 400599 is about 632.9289059602. The cubic root of 400599 is about 73.7173905437.

It can be divided in two parts, 4005 and 99, that multiplied together give a triangular number (396495 = T₈₉₀).

The spelling of 400599 in words is "four hundred thousand, five hundred ninety-nine".