144387891 has 6 divisors (see below), whose sum is σ = 208560300. Its totient is φ = 96258588.

The previous prime is 144387889. The next prime is 144387907. The reversal of 144387891 is 198783441.

It is a happy number.

It is not a de Polignac number, because 144387891 - 2¹ = 144387889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (144387811) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8021541 + ... + 8021558.

It is an arithmetic number, because the mean of its divisors is an integer number (34760050).

Almost surely, 2^144387891 is an apocalyptic number.

144387891 is a deficient number, since it is larger than the sum of its proper divisors (64172409).

144387891 is a wasteful number, since it uses less digits than its factorization.

144387891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16043105 (or 16043102 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 144387891 is about 12016.1512557058. The cubic root of 144387891 is about 524.6184874514.

The spelling of 144387891 in words is "one hundred forty-four million, three hundred eighty-seven thousand, eight hundred ninety-one".