406400023 has 8 divisors (see below), whose sum is σ = 416371392. Its totient is φ = 396483936.

The previous prime is 406400003. The next prime is 406400047. The reversal of 406400023 is 320004604.

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 406400023 - 2⁵ = 406399991 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 (406400003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1261 + ... + 28537.

It is an arithmetic number, because the mean of its divisors is an integer number (52046424).

Almost surely, 2^406400023 is an apocalyptic number.

406400023 is a deficient number, since it is larger than the sum of its proper divisors (9971369).

406400023 is a wasteful number, since it uses less digits than its factorization.

406400023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27641.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 406400023 is about 20159.3656398211. The cubic root of 406400023 is about 740.7151735839.

Adding to 406400023 its reverse (320004604), we get a palindrome (726404627).

The spelling of 406400023 in words is "four hundred six million, four hundred thousand, twenty-three".