142621644 has 48 divisors (see below), whose sum is σ = 369210240. Its totient is φ = 42483840.

The previous prime is 142621637. The next prime is 142621663. The reversal of 142621644 is 446126241.

It is a happy number.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1369 + ... + 16944.

It is an arithmetic number, because the mean of its divisors is an integer number (7691880).

Almost surely, 2^142621644 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 142621644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (184605120).

142621644 is an abundant number, since it is smaller than the sum of its proper divisors (226588596).

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

142621644 is a wasteful number, since it uses less digits than its factorization.

142621644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18390 (or 18388 counting only the distinct ones).

The product of its digits is 9216, while the sum is 30.

The square root of 142621644 is about 11942.4304059098. The cubic root of 142621644 is about 522.4705464804.

Adding to 142621644 its reverse (446126241), we get a palindrome (588747885).

The spelling of 142621644 in words is "one hundred forty-two million, six hundred twenty-one thousand, six hundred forty-four".