142394381 has 4 divisors (see below), whose sum is σ = 142468032. Its totient is φ = 142320732.

The previous prime is 142394339. The next prime is 142394429. The reversal of 142394381 is 183493241.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 142394381 - 2¹⁰ = 142393357 is a prime.

It is a super-2 number, since 2×142394381² = 40552319480746322, 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 (142394281) 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, 33845 + ... + 37818.

It is an arithmetic number, because the mean of its divisors is an integer number (35617008).

Almost surely, 2^142394381 is an apocalyptic number.

It is an amenable number.

142394381 is a deficient number, since it is larger than the sum of its proper divisors (73651).

142394381 is an equidigital number, since it uses as much as digits as its factorization.

142394381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73650.

The product of its digits is 20736, while the sum is 35.

The square root of 142394381 is about 11932.9116731835. The cubic root of 142394381 is about 522.1928856129.

The spelling of 142394381 in words is "one hundred forty-two million, three hundred ninety-four thousand, three hundred eighty-one".