642349 has 8 divisors (see below), whose sum is σ = 668160. Its totient is φ = 617136.

The previous prime is 642281. The next prime is 642359. The reversal of 642349 is 943246.

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

It is a cyclic number.

It is not a de Polignac number, because 642349 - 2¹³ = 634157 is a prime.

It is a super-2 number, since 2×642349² = 825224475602, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3627 + ... + 3799.

It is an arithmetic number, because the mean of its divisors is an integer number (83520).

2⁶⁴²³⁴⁹ is an apocalyptic number.

It is an amenable number.

642349 is a deficient number, since it is larger than the sum of its proper divisors (25811).

642349 is a wasteful number, since it uses less digits than its factorization.

642349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299.

The product of its digits is 5184, while the sum is 28.

The square root of 642349 is about 801.4667803471. The cubic root of 642349 is about 86.2826915210.

The spelling of 642349 in words is "six hundred forty-two thousand, three hundred forty-nine".