142397481 has 4 divisors (see below), whose sum is σ = 189863312. Its totient is φ = 94931652.

The previous prime is 142397471. The next prime is 142397483. The reversal of 142397481 is 184793241.

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, and also an emirpimes, since its reverse is a distinct semiprime: 184793241 = 3 ⋅61597747.

It is not a de Polignac number, because 142397481 - 2⁵ = 142397449 is a prime.

It is a super-2 number, since 2×142397481² = 40554085190290722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (142397483) 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, 23732911 + ... + 23732916.

It is an arithmetic number, because the mean of its divisors is an integer number (47465828).

Almost surely, 2^142397481 is an apocalyptic number.

It is an amenable number.

142397481 is a deficient number, since it is larger than the sum of its proper divisors (47465831).

142397481 is an equidigital number, since it uses as much as digits as its factorization.

142397481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47465830.

The product of its digits is 48384, while the sum is 39.

The square root of 142397481 is about 11933.0415653345. The cubic root of 142397481 is about 522.1966750559.

The spelling of 142397481 in words is "one hundred forty-two million, three hundred ninety-seven thousand, four hundred eighty-one".