144507857 has 4 divisors (see below), whose sum is σ = 155623860. Its totient is φ = 133391856.

The previous prime is 144507851. The next prime is 144507859. The reversal of 144507857 is 758705441.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 55413136 + 89094721 = 7444^2 + 9439^2 .

It is not a de Polignac number, because 144507857 - 2¹² = 144503761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (144507851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5557982 + ... + 5558007.

It is an arithmetic number, because the mean of its divisors is an integer number (38905965).

Almost surely, 2^144507857 is an apocalyptic number.

It is an amenable number.

144507857 is a deficient number, since it is larger than the sum of its proper divisors (11116003).

144507857 is a wasteful number, since it uses less digits than its factorization.

144507857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11116002.

The product of its (nonzero) digits is 156800, while the sum is 41.

The square root of 144507857 is about 12021.1420838454. The cubic root of 144507857 is about 524.7637419199.

The spelling of 144507857 in words is "one hundred forty-four million, five hundred seven thousand, eight hundred fifty-seven".