144721242 has 20 divisors (see below), whose sum is σ = 324283146. Its totient is φ = 48240360.

The previous prime is 144721211. The next prime is 144721249. The reversal of 144721242 is 242127441.

144721242 is a `hidden beast` number, since 1 + 447 + 212 + 4 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 128391561 + 16329681 = 11331^2 + 4041^2 .

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

It is not an unprimeable number, because it can be changed into a prime (144721249) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 446509 + ... + 446832.

Almost surely, 2^144721242 is an apocalyptic number.

144721242 is an abundant number, since it is smaller than the sum of its proper divisors (179561904).

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

144721242 is an equidigital number, since it uses as much as digits as its factorization.

144721242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 893355 (or 893346 counting only the distinct ones).

The product of its digits is 3584, while the sum is 27.

The square root of 144721242 is about 12030.0142144554. The cubic root of 144721242 is about 525.0219092898.

Adding to 144721242 its reverse (242127441), we get a palindrome (386848683).

The spelling of 144721242 in words is "one hundred forty-four million, seven hundred twenty-one thousand, two hundred forty-two".