1399906 has 4 divisors (see below), whose sum is σ = 2099862. Its totient is φ = 699952.

The previous prime is 1399883. The next prime is 1399913. The reversal of 1399906 is 6099931.

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., 1050625 + 349281 = 1025^2 + 591^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349975 + ... + 349978.

2^1399906 is an apocalyptic number.

1399906 is a deficient number, since it is larger than the sum of its proper divisors (699956).

1399906 is an equidigital number, since it uses as much as digits as its factorization.

1399906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 699955.

The product of its (nonzero) digits is 13122, while the sum is 37.

The square root of 1399906 is about 1183.1762337032. The cubic root of 1399906 is about 111.8663904197.

The spelling of 1399906 in words is "one million, three hundred ninety-nine thousand, nine hundred six".