142440431 has 16 divisors (see below), whose sum is σ = 168843840. Its totient is φ = 117573120.

The previous prime is 142440427. The next prime is 142440481. The reversal of 142440431 is 134044241.

It is a happy number.

It is not a de Polignac number, because 142440431 - 2² = 142440427 is a prime.

It is a super-2 number, since 2×142440431² = 40578552766931522, 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 = 142440397 and 142440406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142440421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109175 + ... + 110471.

It is an arithmetic number, because the mean of its divisors is an integer number (10552740).

Almost surely, 2^142440431 is an apocalyptic number.

142440431 is a deficient number, since it is larger than the sum of its proper divisors (26403409).

142440431 is a wasteful number, since it uses less digits than its factorization.

142440431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1874.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 142440431 is about 11934.8410546601. The cubic root of 142440431 is about 522.2491715197.

Adding to 142440431 its reverse (134044241), we get a palindrome (276484672).

The spelling of 142440431 in words is "one hundred forty-two million, four hundred forty thousand, four hundred thirty-one".