144139857 has 4 divisors (see below), whose sum is σ = 192186480. Its totient is φ = 96093236.

The previous prime is 144139829. The next prime is 144139859. The reversal of 144139857 is 758931441.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 144139857 - 2⁸ = 144139601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (144139859) 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 3 ways as a sum of consecutive naturals, for example, 24023307 + ... + 24023312.

It is an arithmetic number, because the mean of its divisors is an integer number (48046620).

Almost surely, 2^144139857 is an apocalyptic number.

It is an amenable number.

144139857 is a deficient number, since it is larger than the sum of its proper divisors (48046623).

144139857 is an equidigital number, since it uses as much as digits as its factorization.

144139857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48046622.

The product of its digits is 120960, while the sum is 42.

The square root of 144139857 is about 12005.8259607576. The cubic root of 144139857 is about 524.3179133010.

The spelling of 144139857 in words is "one hundred forty-four million, one hundred thirty-nine thousand, eight hundred fifty-seven".