7142381 has 4 divisors (see below), whose sum is σ = 7388700. Its totient is φ = 6896064.

The previous prime is 7142371. The next prime is 7142383. The reversal of 7142381 is 1832417.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1832417 = 19 ⋅96443.

It can be written as a sum of positive squares in 2 ways, for example, as 5428900 + 1713481 = 2330^2 + 1309^2 .

It is a cyclic number.

It is not a de Polignac number, because 7142381 - 2¹⁰ = 7141357 is a prime.

It is a super-2 number, since 2×7142381² = 102027212698322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 7142381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7142383) 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, 123116 + ... + 123173.

It is an arithmetic number, because the mean of its divisors is an integer number (1847175).

Almost surely, 2^7142381 is an apocalyptic number.

It is an amenable number.

7142381 is a deficient number, since it is larger than the sum of its proper divisors (246319).

7142381 is a wasteful number, since it uses less digits than its factorization.

7142381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246318.

The product of its digits is 1344, while the sum is 26.

The square root of 7142381 is about 2672.5233394678. The cubic root of 7142381 is about 192.5813992066.

Adding to 7142381 its reverse (1832417), we get a palindrome (8974798).

The spelling of 7142381 in words is "seven million, one hundred forty-two thousand, three hundred eighty-one".