142223440 has 40 divisors (see below), whose sum is σ = 331181928. Its totient is φ = 56801280.

The previous prime is 142223413. The next prime is 142223447. The reversal of 142223440 is 44322241.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 65415744 + 76807696 = 8088^2 + 8764^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142223447) 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, 81780 + ... + 83500.

Almost surely, 2^142223440 is an apocalyptic number.

142223440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

142223440 is an abundant number, since it is smaller than the sum of its proper divisors (188958488).

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

142223440 is a wasteful number, since it uses less digits than its factorization.

142223440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2767 (or 2761 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 142223440 is about 11925.7469367751. The cubic root of 142223440 is about 521.9838419762.

Adding to 142223440 its reverse (44322241), we get a palindrome (186545681).

The spelling of 142223440 in words is "one hundred forty-two million, two hundred twenty-three thousand, four hundred forty".