1388859137 has 4 divisors (see below), whose sum is σ = 1389317700. Its totient is φ = 1388400576.

The previous prime is 1388859113. The next prime is 1388859139. The reversal of 1388859137 is 7319588831.

It is a happy number.

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 323424256 + 1065434881 = 17984^2 + 32641^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1388859137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1388859139) 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, 224708 + ... + 230805.

It is an arithmetic number, because the mean of its divisors is an integer number (347329425).

Almost surely, 2^1388859137 is an apocalyptic number.

It is an amenable number.

1388859137 is a deficient number, since it is larger than the sum of its proper divisors (458563).

1388859137 is an equidigital number, since it uses as much as digits as its factorization.

1388859137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458562.

The product of its digits is 1451520, while the sum is 53.

The square root of 1388859137 is about 37267.4004593827. The cubic root of 1388859137 is about 1115.7136166555.

The spelling of 1388859137 in words is "one billion, three hundred eighty-eight million, eight hundred fifty-nine thousand, one hundred thirty-seven".