400345623 has 24 divisors (see below), whose sum is σ = 598890240. Its totient is φ = 257549760.

The previous prime is 400345601. The next prime is 400345643. The reversal of 400345623 is 326543004.

400345623 is a `hidden beast` number, since 4 + 0 + 0 + 34 + 5 + 623 = 666.

It is not a de Polignac number, because 400345623 - 2⁵ = 400345591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400345643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22218 + ... + 35976.

It is an arithmetic number, because the mean of its divisors is an integer number (24953760).

Almost surely, 2^400345623 is an apocalyptic number.

400345623 is a deficient number, since it is larger than the sum of its proper divisors (198544617).

400345623 is a wasteful number, since it uses less digits than its factorization.

400345623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13879 (or 13876 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 27.

The square root of 400345623 is about 20008.6387093175. The cubic root of 400345623 is about 737.0184529720.

Adding to 400345623 its reverse (326543004), we get a palindrome (726888627).

The spelling of 400345623 in words is "four hundred million, three hundred forty-five thousand, six hundred twenty-three".