391088 has 10 divisors (see below), whose sum is σ = 757764. Its totient is φ = 195536.

The previous prime is 391073. The next prime is 391103. The reversal of 391088 is 880193.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (391073) and next prime (391103).

It is a nialpdrome in base 9.

It is a self number, because there is not a number n which added to its sum of digits gives 391088.

It is an unprimeable number.

391088 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 as a sum of consecutive naturals, namely, 12206 + ... + 12237.

2³⁹¹⁰⁸⁸ is an apocalyptic number.

It is an amenable number.

391088 is a deficient number, since it is larger than the sum of its proper divisors (366676).

391088 is a wasteful number, since it uses less digits than its factorization.

391088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24451 (or 24445 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 391088 is about 625.3702903081. The cubic root of 391088 is about 73.1293135498.

The spelling of 391088 in words is "three hundred ninety-one thousand, eighty-eight".