144721899 has 24 divisors (see below), whose sum is σ = 239466240. Its totient is φ = 82504368.

The previous prime is 144721897. The next prime is 144721903. The reversal of 144721899 is 998127441.

It is a happy number.

It is not a de Polignac number, because 144721899 - 2¹ = 144721897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (144721891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26962 + ... + 31880.

It is an arithmetic number, because the mean of its divisors is an integer number (9977760).

Almost surely, 2^144721899 is an apocalyptic number.

144721899 is a deficient number, since it is larger than the sum of its proper divisors (94744341).

144721899 is a wasteful number, since it uses less digits than its factorization.

144721899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5399 (or 5396 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 144721899 is about 12030.0415211254. The cubic root of 144721899 is about 525.0227037801.

The spelling of 144721899 in words is "one hundred forty-four million, seven hundred twenty-one thousand, eight hundred ninety-nine".