723400431 has 16 divisors (see below), whose sum is σ = 1066804704. Its totient is φ = 433137024.

The previous prime is 723400427. The next prime is 723400441. The reversal of 723400431 is 134004327.

It is not a de Polignac number, because 723400431 - 2² = 723400427 is a prime.

It is a super-2 number, since 2×723400431² = 1046616367141971522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (723400411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 249216 + ... + 252101.

It is an arithmetic number, because the mean of its divisors is an integer number (66675294).

Almost surely, 2^723400431 is an apocalyptic number.

723400431 is a deficient number, since it is larger than the sum of its proper divisors (343404273).

723400431 is a wasteful number, since it uses less digits than its factorization.

723400431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501370.

The product of its (nonzero) digits is 2016, while the sum is 24.

The square root of 723400431 is about 26896.1043833489. The cubic root of 723400431 is about 897.6897252814.

Adding to 723400431 its reverse (134004327), we get a palindrome (857404758).

The spelling of 723400431 in words is "seven hundred twenty-three million, four hundred thousand, four hundred thirty-one".