1381018 has 4 divisors (see below), whose sum is σ = 2071530. Its totient is φ = 690508.

The previous prime is 1380997. The next prime is 1381027. The reversal of 1381018 is 8101831.

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., 1270129 + 110889 = 1127^2 + 333^2 .

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1381018.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345253 + ... + 345256.

2^1381018 is an apocalyptic number.

1381018 is a deficient number, since it is larger than the sum of its proper divisors (690512).

1381018 is an equidigital number, since it uses as much as digits as its factorization.

1381018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690511.

The product of its (nonzero) digits is 192, while the sum is 22.

The square root of 1381018 is about 1175.1672221433. The cubic root of 1381018 is about 111.3609976632.

Adding to 1381018 its reverse (8101831), we get a palindrome (9482849).

It can be divided in two parts, 138 and 1018, that added together give a square (1156 = 34²).

The spelling of 1381018 in words is "one million, three hundred eighty-one thousand, eighteen".