42723231 has 4 divisors (see below), whose sum is σ = 56964312. Its totient is φ = 28482152.

The previous prime is 42723223. The next prime is 42723251. The reversal of 42723231 is 13232724.

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 42723231 - 2³ = 42723223 is a prime.

It is a super-2 number, since 2×42723231² = 3650548934158722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42723211) 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, 7120536 + ... + 7120541.

It is an arithmetic number, because the mean of its divisors is an integer number (14241078).

Almost surely, 2^42723231 is an apocalyptic number.

42723231 is a deficient number, since it is larger than the sum of its proper divisors (14241081).

42723231 is a wasteful number, since it uses less digits than its factorization.

42723231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14241080.

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

The square root of 42723231 is about 6536.3010181600. The cubic root of 42723231 is about 349.5865348833.

Adding to 42723231 its reverse (13232724), we get a palindrome (55955955).

It can be divided in two parts, 4272 and 3231, that added together give a triangular number (7503 = T₁₂₂).

The spelling of 42723231 in words is "forty-two million, seven hundred twenty-three thousand, two hundred thirty-one".