1001399 has 8 divisors (see below), whose sum is σ = 1184160. Its totient is φ = 828576.

The previous prime is 1001389. The next prime is 1001401. The reversal of 1001399 is 9931001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1001399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001369) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2264 + ... + 2669.

It is an arithmetic number, because the mean of its divisors is an integer number (148020).

2^1001399 is an apocalyptic number.

1001399 is a deficient number, since it is larger than the sum of its proper divisors (182761).

1001399 is an equidigital number, since it uses as much as digits as its factorization.

1001399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4969.

The product of its (nonzero) digits is 243, while the sum is 23.

The square root of 1001399 is about 1000.6992555209. The cubic root of 1001399 is about 100.0466116035.

The spelling of 1001399 in words is "one million, one thousand, three hundred ninety-nine".