1391618 has 4 divisors (see below), whose sum is σ = 2087430. Its totient is φ = 695808.

The previous prime is 1391597. The next prime is 1391627. The reversal of 1391618 is 8161931.

It is a happy number.

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., 946729 + 444889 = 973^2 + 667^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 347903 + ... + 347906.

2^1391618 is an apocalyptic number.

1391618 is a deficient number, since it is larger than the sum of its proper divisors (695812).

1391618 is an equidigital number, since it uses as much as digits as its factorization.

1391618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695811.

The product of its digits is 1296, while the sum is 29.

The square root of 1391618 is about 1179.6685975307. The cubic root of 1391618 is about 111.6451888100.

The spelling of 1391618 in words is "one million, three hundred ninety-one thousand, six hundred eighteen".