342721399 has 4 divisors (see below), whose sum is σ = 353776960. Its totient is φ = 331665840.

The previous prime is 342721361. The next prime is 342721409. The reversal of 342721399 is 993127243.

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 342721399 - 2¹³ = 342713207 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (342721339) 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, 5527734 + ... + 5527795.

It is an arithmetic number, because the mean of its divisors is an integer number (88444240).

Almost surely, 2^342721399 is an apocalyptic number.

342721399 is a deficient number, since it is larger than the sum of its proper divisors (11055561).

342721399 is a wasteful number, since it uses less digits than its factorization.

342721399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11055560.

The product of its digits is 81648, while the sum is 40.

The square root of 342721399 is about 18512.7361294866. The cubic root of 342721399 is about 699.8104241734.

It can be divided in two parts, 34272 and 1399, that multiplied together give a triangular number (47946528 = T₉₇₉₂).

The spelling of 342721399 in words is "three hundred forty-two million, seven hundred twenty-one thousand, three hundred ninety-nine".