142122440 has 16 divisors (see below), whose sum is σ = 319775580. Its totient is φ = 56848960.

The previous prime is 142122437. The next prime is 142122457. The reversal of 142122440 is 44221241.

It can be written as a sum of positive squares in 2 ways, for example, as 129914404 + 12208036 = 11398^2 + 3494^2 .

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1776491 + ... + 1776570.

Almost surely, 2^142122440 is an apocalyptic number.

142122440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

142122440 is an abundant number, since it is smaller than the sum of its proper divisors (177653140).

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

142122440 is a wasteful number, since it uses less digits than its factorization.

142122440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3553072 (or 3553068 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 142122440 is about 11921.5116491156. The cubic root of 142122440 is about 521.8602504108.

Adding to 142122440 its reverse (44221241), we get a palindrome (186343681).

The spelling of 142122440 in words is "one hundred forty-two million, one hundred twenty-two thousand, four hundred forty".