291485340 has 72 divisors (see below), whose sum is σ = 886616640. Its totient is φ = 77514624.

The previous prime is 291485339. The next prime is 291485353. The reversal of 291485340 is 43584192.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 291485295 and 291485304.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69421 + ... + 73499.

It is an arithmetic number, because the mean of its divisors is an integer number (12314120).

Almost surely, 2^291485340 is an apocalyptic number.

291485340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 291485340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (443308320).

291485340 is an abundant number, since it is smaller than the sum of its proper divisors (595131300).

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

291485340 is a wasteful number, since it uses less digits than its factorization.

291485340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4491 (or 4486 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 291485340 is about 17072.9417500324. The cubic root of 291485340 is about 663.0387425065.

The spelling of 291485340 in words is "two hundred ninety-one million, four hundred eighty-five thousand, three hundred forty".