144402140 has 12 divisors (see below), whose sum is σ = 303244536. Its totient is φ = 57760848.

The previous prime is 144402121. The next prime is 144402169. The reversal of 144402140 is 41204441.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 7220107 = 144402140 / (1 + 4 + 4 + 4 + 0 + 2 + 1 + 4 + 0).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3610034 + ... + 3610073.

It is an arithmetic number, because the mean of its divisors is an integer number (25270378).

Almost surely, 2^144402140 is an apocalyptic number.

144402140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

144402140 is an abundant number, since it is smaller than the sum of its proper divisors (158842396).

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

144402140 is a wasteful number, since it uses less digits than its factorization.

144402140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7220116 (or 7220114 counting only the distinct ones).

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

The square root of 144402140 is about 12016.7441513914. The cubic root of 144402140 is about 524.6357443070.

Adding to 144402140 its reverse (41204441), we get a palindrome (185606581).

The spelling of 144402140 in words is "one hundred forty-four million, four hundred two thousand, one hundred forty".