400023543 has 8 divisors (see below), whose sum is σ = 542108656. Its totient is φ = 262310400.

The previous prime is 400023541. The next prime is 400023551. The reversal of 400023543 is 345320004.

It is a happy number.

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

It is not a de Polignac number, because 400023543 - 2¹ = 400023541 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 (400023541) 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, 1092778 + ... + 1093143.

It is an arithmetic number, because the mean of its divisors is an integer number (67763582).

Almost surely, 2^400023543 is an apocalyptic number.

400023543 is a deficient number, since it is larger than the sum of its proper divisors (142085113).

400023543 is a wasteful number, since it uses less digits than its factorization.

400023543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2185985.

The product of its (nonzero) digits is 1440, while the sum is 21.

The square root of 400023543 is about 20000.5885663397. The cubic root of 400023543 is about 736.8207549701.

Adding to 400023543 its reverse (345320004), we get a palindrome (745343547).

The spelling of 400023543 in words is "four hundred million, twenty-three thousand, five hundred forty-three".