142005440 has 56 divisors (see below), whose sum is σ = 342839040. Its totient is φ = 56014848.

The previous prime is 142005433. The next prime is 142005443. The reversal of 142005440 is 44500241.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (142005443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20321 + ... + 26399.

Almost surely, 2^142005440 is an apocalyptic number.

142005440 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 142005440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (171419520).

142005440 is an abundant number, since it is smaller than the sum of its proper divisors (200833600).

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

142005440 is an equidigital number, since it uses as much as digits as its factorization.

142005440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6169 (or 6159 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 142005440 is about 11916.6035429564. The cubic root of 142005440 is about 521.7170067591.

Adding to 142005440 its reverse (44500241), we get a palindrome (186505681).

The spelling of 142005440 in words is "one hundred forty-two million, five thousand, four hundred forty".