291340 has 24 divisors (see below), whose sum is σ = 699552. Its totient is φ = 99840.

The previous prime is 291337. The next prime is 291349. The reversal of 291340 is 43192.

291340 = 201² + 202² + ... + 207².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (291349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 901 + ... + 1180.

It is an arithmetic number, because the mean of its divisors is an integer number (29148).

2²⁹¹³⁴⁰ is an apocalyptic number.

291340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

291340 is an abundant number, since it is smaller than the sum of its proper divisors (408212).

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

291340 is a wasteful number, since it uses less digits than its factorization.

291340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2097 (or 2095 counting only the distinct ones).

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

The square root of 291340 is about 539.7592055723. The cubic root of 291340 is about 66.2928523045.

It can be divided in two parts, 29 and 1340, that added together give a square (1369 = 37²).

The spelling of 291340 in words is "two hundred ninety-one thousand, three hundred forty".