642719 has 16 divisors (see below), whose sum is σ = 850176. Its totient is φ = 470400.

The previous prime is 642701. The next prime is 642737. The reversal of 642719 is 917246.

It is an interprime number because it is at equal distance from previous prime (642701) and next prime (642737).

It is a de Polignac number, because none of the positive numbers 2^k-642719 is a prime.

It is a super-2 number, since 2×642719² = 826175425922, which contains 22 as substring.

It is a d-powerful number, because it can be written as 6² + 4² + 7⁶ + 2¹⁹ + 1 + 9³ .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 642691 and 642700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1064 + ... + 1554.

It is an arithmetic number, because the mean of its divisors is an integer number (53136).

2⁶⁴²⁷¹⁹ is an apocalyptic number.

642719 is a deficient number, since it is larger than the sum of its proper divisors (207457).

642719 is a wasteful number, since it uses less digits than its factorization.

642719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526.

The product of its digits is 3024, while the sum is 29.

The square root of 642719 is about 801.6975739018. The cubic root of 642719 is about 86.2992549303.

It can be divided in two parts, 6427 and 19, that added together give a palindrome (6446).

The spelling of 642719 in words is "six hundred forty-two thousand, seven hundred nineteen".