1399616 has 28 divisors (see below), whose sum is σ = 2926080. Its totient is φ = 662400.

The previous prime is 1399609. The next prime is 1399621. The reversal of 1399616 is 6169931.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 641 + ... + 1791.

2^1399616 is an apocalyptic number.

1399616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1399616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1463040).

1399616 is an abundant number, since it is smaller than the sum of its proper divisors (1526464).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1399616 is a wasteful number, since it uses less digits than its factorization.

1399616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1182 (or 1172 counting only the distinct ones).

The product of its digits is 8748, while the sum is 35.

The square root of 1399616 is about 1183.0536758744. The cubic root of 1399616 is about 111.8586652597.

The spelling of 1399616 in words is "one million, three hundred ninety-nine thousand, six hundred sixteen".