7142239 has 4 divisors (see below), whose sum is σ = 7691656. Its totient is φ = 6592824.

The previous prime is 7142209. The next prime is 7142263. The reversal of 7142239 is 9322417.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9322417 = 13 ⋅717109.

It is a cyclic number.

It is not a de Polignac number, because 7142239 - 2⁷ = 7142111 is a prime.

It is a Duffinian number.

7142239 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7142209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 274689 + ... + 274714.

It is an arithmetic number, because the mean of its divisors is an integer number (1922914).

Almost surely, 2^7142239 is an apocalyptic number.

7142239 is a deficient number, since it is larger than the sum of its proper divisors (549417).

7142239 is a wasteful number, since it uses less digits than its factorization.

7142239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549416.

The product of its digits is 3024, while the sum is 28.

The square root of 7142239 is about 2672.4967726828. The cubic root of 7142239 is about 192.5801229403.

It can be divided in two parts, 7142 and 239, that added together give a triangular number (7381 = T₁₂₁).

The spelling of 7142239 in words is "seven million, one hundred forty-two thousand, two hundred thirty-nine".