1396550138 has 4 divisors (see below), whose sum is σ = 2094825210. Its totient is φ = 698275068.

The previous prime is 1396550107. The next prime is 1396550149. The reversal of 1396550138 is 8310556931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8310556931 = 971 ⋅8558761.

It can be written as a sum of positive squares in only one way, i.e., 1275704089 + 120846049 = 35717^2 + 10993^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1396550095 and 1396550104.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349137533 + ... + 349137536.

Almost surely, 2^1396550138 is an apocalyptic number.

1396550138 is a deficient number, since it is larger than the sum of its proper divisors (698275072).

1396550138 is an equidigital number, since it uses as much as digits as its factorization.

1396550138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 698275071.

The product of its (nonzero) digits is 97200, while the sum is 41.

The square root of 1396550138 is about 37370.4447123659. Note that the first 3 decimals coincide. The cubic root of 1396550138 is about 1117.7692999745.

The spelling of 1396550138 in words is "one billion, three hundred ninety-six million, five hundred fifty thousand, one hundred thirty-eight".