1394131138 has 8 divisors (see below), whose sum is σ = 2214208332. Its totient is φ = 656061696.

The previous prime is 1394131049. The next prime is 1394131139. The reversal of 1394131138 is 8311314931.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1384063209 + 10067929 = 37203^2 + 3173^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (34), and also a Moran number because the ratio is a prime number: 41003857 = 1394131138 / (1 + 3 + 9 + 4 + 1 + 3 + 1 + 1 + 3 + 8).

It is not an unprimeable number, because it can be changed into a prime (1394131139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20501895 + ... + 20501962.

Almost surely, 2^1394131138 is an apocalyptic number.

1394131138 is a deficient number, since it is larger than the sum of its proper divisors (820077194).

1394131138 is a wasteful number, since it uses less digits than its factorization.

1394131138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41003876.

The product of its digits is 7776, while the sum is 34.

The square root of 1394131138 is about 37338.0655363933. The cubic root of 1394131138 is about 1117.1235547861.

The spelling of 1394131138 in words is "one billion, three hundred ninety-four million, one hundred thirty-one thousand, one hundred thirty-eight".