285723431 has 4 divisors (see below), whose sum is σ = 326541072. Its totient is φ = 244905792.

The previous prime is 285723419. The next prime is 285723469. The reversal of 285723431 is 134327582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134327582 = 2 ⋅67163791.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-285723431 is a prime.

It is a super-2 number, since 2×285723431² = 163275758044823522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 285723391 and 285723400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285723401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20408810 + ... + 20408823.

It is an arithmetic number, because the mean of its divisors is an integer number (81635268).

Almost surely, 2^285723431 is an apocalyptic number.

285723431 is a deficient number, since it is larger than the sum of its proper divisors (40817641).

285723431 is an equidigital number, since it uses as much as digits as its factorization.

285723431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40817640.

The product of its digits is 40320, while the sum is 35.

The square root of 285723431 is about 16903.3556136052. The cubic root of 285723431 is about 658.6407832262.

The spelling of 285723431 in words is "two hundred eighty-five million, seven hundred twenty-three thousand, four hundred thirty-one".