1390138 has 4 divisors (see below), whose sum is σ = 2085210. Its totient is φ = 695068.

The previous prime is 1390121. The next prime is 1390157. The reversal of 1390138 is 8310931.

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

It can be written as a sum of positive squares in only one way, i.e., 1315609 + 74529 = 1147^2 + 273^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 347533 + ... + 347536.

2^1390138 is an apocalyptic number.

1390138 is a deficient number, since it is larger than the sum of its proper divisors (695072).

1390138 is an equidigital number, since it uses as much as digits as its factorization.

1390138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695071.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 1390138 is about 1179.0411358388. The cubic root of 1390138 is about 111.6055961703.

The spelling of 1390138 in words is "one million, three hundred ninety thousand, one hundred thirty-eight".