342689721 has 8 divisors (see below), whose sum is σ = 498457824. Its totient is φ = 207690720.

The previous prime is 342689701. The next prime is 342689729. The reversal of 342689721 is 127986243.

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

It is not a de Polignac number, because 342689721 - 2²⁵ = 309135289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (342689729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5192236 + ... + 5192301.

It is an arithmetic number, because the mean of its divisors is an integer number (62307228).

Almost surely, 2^342689721 is an apocalyptic number.

It is an amenable number.

342689721 is a deficient number, since it is larger than the sum of its proper divisors (155768103).

342689721 is a wasteful number, since it uses less digits than its factorization.

342689721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10384551.

The product of its digits is 145152, while the sum is 42.

The square root of 342689721 is about 18511.8805365635. The cubic root of 342689721 is about 699.7888621722.

The spelling of 342689721 in words is "three hundred forty-two million, six hundred eighty-nine thousand, seven hundred twenty-one".