391402 has 8 divisors (see below), whose sum is σ = 640512. Its totient is φ = 177900.

The previous prime is 391399. The next prime is 391403. The reversal of 391402 is 204193.

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

It is a self number, because there is not a number n which added to its sum of digits gives 391402.

It is not an unprimeable number, because it can be changed into a prime (391403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8874 + ... + 8917.

It is an arithmetic number, because the mean of its divisors is an integer number (80064).

2³⁹¹⁴⁰² is an apocalyptic number.

391402 is a deficient number, since it is larger than the sum of its proper divisors (249110).

391402 is a wasteful number, since it uses less digits than its factorization.

391402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17804.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 391402 is about 625.6212911978. The cubic root of 391402 is about 73.1488798723.

Adding to 391402 its reverse (204193), we get a palindrome (595595).

It can be divided in two parts, 39 and 1402, that added together give a palindrome (1441).

The spelling of 391402 in words is "three hundred ninety-one thousand, four hundred two".