721342 has 8 divisors (see below), whose sum is σ = 1093032. Its totient is φ = 357000.

The previous prime is 721337. The next prime is 721351. The reversal of 721342 is 243127.

721342 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an Ulam number.

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, 1584 + ... + 1987.

It is an arithmetic number, because the mean of its divisors is an integer number (136629).

2⁷²¹³⁴² is an apocalyptic number.

721342 is a deficient number, since it is larger than the sum of its proper divisors (371690).

721342 is a wasteful number, since it uses less digits than its factorization.

721342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3674.

The product of its digits is 336, while the sum is 19.

The square root of 721342 is about 849.3185503685. The cubic root of 721342 is about 89.6837459731.

Adding to 721342 its reverse (243127), we get a palindrome (964469).

The spelling of 721342 in words is "seven hundred twenty-one thousand, three hundred forty-two", and thus it is an iban number.