285721342 has 8 divisors (see below), whose sum is σ = 428715000. Its totient is φ = 142816344.

The previous prime is 285721339. The next prime is 285721379. The reversal of 285721342 is 243127582.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 285721298 and 285721307.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13417 + ... + 27412.

It is an arithmetic number, because the mean of its divisors is an integer number (53589375).

Almost surely, 2^285721342 is an apocalyptic number.

285721342 is a deficient number, since it is larger than the sum of its proper divisors (142993658).

285721342 is a wasteful number, since it uses less digits than its factorization.

285721342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44330.

The product of its digits is 26880, while the sum is 34.

The square root of 285721342 is about 16903.2938210279. The cubic root of 285721342 is about 658.6391780563.

The spelling of 285721342 in words is "two hundred eighty-five million, seven hundred twenty-one thousand, three hundred forty-two".