144636721 has 8 divisors (see below), whose sum is σ = 153222080. Its totient is φ = 136148688.

The previous prime is 144636703. The next prime is 144636733. The reversal of 144636721 is 127636441.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 144636721 - 2⁵ = 144636689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (144636761) 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, 21261 + ... + 27226.

It is an arithmetic number, because the mean of its divisors is an integer number (19152760).

Almost surely, 2^144636721 is an apocalyptic number.

It is an amenable number.

144636721 is a deficient number, since it is larger than the sum of its proper divisors (8585359).

144636721 is a wasteful number, since it uses less digits than its factorization.

144636721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48663.

The product of its digits is 24192, while the sum is 34.

The square root of 144636721 is about 12026.5007795285. The cubic root of 144636721 is about 524.9196805319.

The spelling of 144636721 in words is "one hundred forty-four million, six hundred thirty-six thousand, seven hundred twenty-one".