142440000 has 140 divisors (see below), whose sum is σ = 471336624. Its totient is φ = 37952000.

The previous prime is 142439993. The next prime is 142440007. The reversal of 142440000 is 44241.

It is an interprime number because it is at equal distance from previous prime (142439993) and next prime (142440007).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (142440007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 119407 + ... + 120593.

Almost surely, 2^142440000 is an apocalyptic number.

142440000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 142440000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (235668312).

142440000 is an abundant number, since it is smaller than the sum of its proper divisors (328896624).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

142440000 is an equidigital number, since it uses as much as digits as its factorization.

142440000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1222 (or 1197 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 142440000 is about 11934.8229982686. The cubic root of 142440000 is about 522.2486447741.

Adding to 142440000 its reverse (44241), we get a palindrome (142484241).

The spelling of 142440000 in words is "one hundred forty-two million, four hundred forty thousand".