1399418 has 4 divisors (see below), whose sum is σ = 2099130. Its totient is φ = 699708.

The previous prime is 1399417. The next prime is 1399427. The reversal of 1399418 is 8149931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8149931 = 31 ⋅262901.

It can be written as a sum of positive squares in only one way, i.e., 954529 + 444889 = 977^2 + 667^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1399417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349853 + ... + 349856.

2^1399418 is an apocalyptic number.

1399418 is a deficient number, since it is larger than the sum of its proper divisors (699712).

1399418 is an equidigital number, since it uses as much as digits as its factorization.

1399418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 699711.

The product of its digits is 7776, while the sum is 35.

The square root of 1399418 is about 1182.9699911663. The cubic root of 1399418 is about 111.8533902270.

The spelling of 1399418 in words is "one million, three hundred ninety-nine thousand, four hundred eighteen".