142213644 has 60 divisors (see below), whose sum is σ = 381854704. Its totient is φ = 46119456.

The previous prime is 142213633. The next prime is 142213657. The reversal of 142213644 is 446312241.

It is a happy number.

142213644 is a `hidden beast` number, since 1 + 4 + 2 + 2 + 13 + 644 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6057 + ... + 17919.

Almost surely, 2^142213644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 142213644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (190927352).

142213644 is an abundant number, since it is smaller than the sum of its proper divisors (239641060).

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

142213644 is a wasteful number, since it uses less digits than its factorization.

142213644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11916 (or 11905 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 142213644 is about 11925.3362216753. The cubic root of 142213644 is about 521.9718573809.

Adding to 142213644 its reverse (446312241), we get a palindrome (588525885).

The spelling of 142213644 in words is "one hundred forty-two million, two hundred thirteen thousand, six hundred forty-four".