1002391 has 8 divisors (see below), whose sum is σ = 1093680. Its totient is φ = 913152.

The previous prime is 1002377. The next prime is 1002403. The reversal of 1002391 is 1932001.

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

It is a cyclic number.

It is not a de Polignac number, because 1002391 - 2⁵ = 1002359 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 (1002341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 615 + ... + 1543.

It is an arithmetic number, because the mean of its divisors is an integer number (136710).

2^1002391 is an apocalyptic number.

1002391 is a deficient number, since it is larger than the sum of its proper divisors (91289).

1002391 is an equidigital number, since it uses as much as digits as its factorization.

1002391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1025.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 1002391 is about 1001.1947862429. The cubic root of 1002391 is about 100.0796365633.

Adding to 1002391 its reverse (1932001), we get a palindrome (2934392).

The spelling of 1002391 in words is "one million, two thousand, three hundred ninety-one".