400405623 has 8 divisors (see below), whose sum is σ = 534630000. Its totient is φ = 266559168.

The previous prime is 400405613. The next prime is 400405633. The reversal of 400405623 is 326504004.

It is an interprime number because it is at equal distance from previous prime (400405613) and next prime (400405633).

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

It is not a de Polignac number, because 400405623 - 2¹⁴ = 400389239 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 400405593 and 400405602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400405613) 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, 91998 + ... + 96251.

It is an arithmetic number, because the mean of its divisors is an integer number (66828750).

Almost surely, 2^400405623 is an apocalyptic number.

400405623 is a deficient number, since it is larger than the sum of its proper divisors (134224377).

400405623 is a wasteful number, since it uses less digits than its factorization.

400405623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188961.

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 400405623 is about 20010.1380055211. The cubic root of 400405623 is about 737.0552702417.

Adding to 400405623 its reverse (326504004), we get a palindrome (726909627).

The spelling of 400405623 in words is "four hundred million, four hundred five thousand, six hundred twenty-three".