391953 has 4 divisors (see below), whose sum is σ = 522608. Its totient is φ = 261300.

The previous prime is 391939. The next prime is 391961. The reversal of 391953 is 359193.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 391953 - 2⁵ = 391921 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 6.

It is a self number, because there is not a number n which added to its sum of digits gives 391953.

It is not an unprimeable number, because it can be changed into a prime (391903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65323 + ... + 65328.

It is an arithmetic number, because the mean of its divisors is an integer number (130652).

2³⁹¹⁹⁵³ is an apocalyptic number.

It is an amenable number.

391953 is a deficient number, since it is larger than the sum of its proper divisors (130655).

391953 is a wasteful number, since it uses less digits than its factorization.

391953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130654.

The product of its digits is 3645, while the sum is 30.

The square root of 391953 is about 626.0614985766. The cubic root of 391953 is about 73.1831891283.

It can be divided in two parts, 39 and 1953, that multiplied together give a palindrome (76167).

The spelling of 391953 in words is "three hundred ninety-one thousand, nine hundred fifty-three".