391029 has 4 divisors (see below), whose sum is σ = 521376. Its totient is φ = 260684.

The previous prime is 391021. The next prime is 391031. The reversal of 391029 is 920193.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 391029 - 2³ = 391021 is a prime.

It is a D-number.

391029 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 391029.

It is not an unprimeable number, because it can be changed into a prime (391021) 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, 65169 + ... + 65174.

It is an arithmetic number, because the mean of its divisors is an integer number (130344).

2³⁹¹⁰²⁹ is an apocalyptic number.

It is an amenable number.

391029 is a deficient number, since it is larger than the sum of its proper divisors (130347).

391029 is a wasteful number, since it uses less digits than its factorization.

391029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130346.

The product of its (nonzero) digits is 486, while the sum is 24.

The square root of 391029 is about 625.3231164766. The cubic root of 391029 is about 73.1256359065.

The spelling of 391029 in words is "three hundred ninety-one thousand, twenty-nine".