406403023 has 4 divisors (see below), whose sum is σ = 437664808. Its totient is φ = 375141240.

The previous prime is 406403021. The next prime is 406403047. The reversal of 406403023 is 320304604.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 406403023 - 2¹ = 406403021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 406402985 and 406403003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406403021) 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 3 ways as a sum of consecutive naturals, for example, 15630873 + ... + 15630898.

It is an arithmetic number, because the mean of its divisors is an integer number (109416202).

Almost surely, 2^406403023 is an apocalyptic number.

406403023 is a deficient number, since it is larger than the sum of its proper divisors (31261785).

406403023 is a wasteful number, since it uses less digits than its factorization.

406403023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31261784.

The product of its (nonzero) digits is 1728, while the sum is 22.

The square root of 406403023 is about 20159.4400467870. The cubic root of 406403023 is about 740.7169962052.

Adding to 406403023 its reverse (320304604), we get a palindrome (726707627).

The spelling of 406403023 in words is "four hundred six million, four hundred three thousand, twenty-three".