1388135941 has 4 divisors (see below), whose sum is σ = 1394197900. Its totient is φ = 1382073984.

The previous prime is 1388135927. The next prime is 1388135971. The reversal of 1388135941 is 1495318831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1495318831 = 41 ⋅36471191.

It can be written as a sum of positive squares in 2 ways, for example, as 865830625 + 522305316 = 29425^2 + 22854^2 .

It is a cyclic number.

It is not a de Polignac number, because 1388135941 - 2⁵ = 1388135909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388135971) 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, 3030636 + ... + 3031093.

It is an arithmetic number, because the mean of its divisors is an integer number (348549475).

Almost surely, 2^1388135941 is an apocalyptic number.

It is an amenable number.

1388135941 is a deficient number, since it is larger than the sum of its proper divisors (6061959).

1388135941 is an equidigital number, since it uses as much as digits as its factorization.

1388135941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6061958.

The product of its digits is 103680, while the sum is 43.

The square root of 1388135941 is about 37257.6963995360. The cubic root of 1388135941 is about 1115.5199277746.

The spelling of 1388135941 in words is "one billion, three hundred eighty-eight million, one hundred thirty-five thousand, nine hundred forty-one".