144402638 has 16 divisors (see below), whose sum is σ = 222931104. Its totient is φ = 70100640.

The previous prime is 144402637. The next prime is 144402647. The reversal of 144402638 is 836204441.

144402638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×144402638³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144402631) 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, 38231 + ... + 41837.

It is an arithmetic number, because the mean of its divisors is an integer number (13933194).

Almost surely, 2^144402638 is an apocalyptic number.

144402638 is a deficient number, since it is larger than the sum of its proper divisors (78528466).

144402638 is a wasteful number, since it uses less digits than its factorization.

144402638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4187.

The product of its (nonzero) digits is 18432, while the sum is 32.

The square root of 144402638 is about 12016.7648724605. The cubic root of 144402638 is about 524.6363474105.

The spelling of 144402638 in words is "one hundred forty-four million, four hundred two thousand, six hundred thirty-eight".