142621440 has 144 divisors (see below), whose sum is σ = 490707168. Its totient is φ = 35094528.

The previous prime is 142621417. The next prime is 142621471. The reversal of 142621440 is 44126241.

It is a happy number.

142621440 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 142621440.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48492 + ... + 51348.

Almost surely, 2^142621440 is an apocalyptic number.

142621440 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 142621440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (245353584).

142621440 is an abundant number, since it is smaller than the sum of its proper divisors (348085728).

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

142621440 is a wasteful number, since it uses less digits than its factorization.

142621440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2894 (or 2880 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 142621440 is about 11942.4218649318. The cubic root of 142621440 is about 522.4702973737.

Adding to 142621440 its reverse (44126241), we get a palindrome (186747681).

The spelling of 142621440 in words is "one hundred forty-two million, six hundred twenty-one thousand, four hundred forty".