391902 has 48 divisors (see below), whose sum is σ = 963072. Its totient is φ = 105840.

The previous prime is 391891. The next prime is 391903. The reversal of 391902 is 209193.

It is a happy number.

It is a congruent number.

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

391902 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9093 + ... + 9135.

It is an arithmetic number, because the mean of its divisors is an integer number (20064).

2³⁹¹⁹⁰² is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 391902, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (481536).

391902 is an abundant number, since it is smaller than the sum of its proper divisors (571170).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

391902 is a wasteful number, since it uses less digits than its factorization.

391902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93 (or 86 counting only the distinct ones).

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

The square root of 391902 is about 626.0207664287. The cubic root of 391902 is about 73.1800148493.

The spelling of 391902 in words is "three hundred ninety-one thousand, nine hundred two".