142402231 has 4 divisors (see below), whose sum is σ = 142436632. Its totient is φ = 142367832.

The previous prime is 142402229. The next prime is 142402277. The reversal of 142402231 is 132204241.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 142402231 - 2¹ = 142402229 is a prime.

It is a super-2 number, since 2×142402231² = 40556790787554722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 142402199 and 142402208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142402201) 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, 9981 + ... + 19606.

It is an arithmetic number, because the mean of its divisors is an integer number (35609158).

Almost surely, 2^142402231 is an apocalyptic number.

142402231 is a deficient number, since it is larger than the sum of its proper divisors (34401).

142402231 is an equidigital number, since it uses as much as digits as its factorization.

142402231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34400.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 142402231 is about 11933.2405908873. The cubic root of 142402231 is about 522.2024813539.

Adding to 142402231 its reverse (132204241), we get a palindrome (274606472).

It can be divided in two parts, 14240 and 2231, that added together give a triangular number (16471 = T₁₈₁).

The spelling of 142402231 in words is "one hundred forty-two million, four hundred two thousand, two hundred thirty-one".