291994940 has 48 divisors (see below), whose sum is σ = 631602048. Its totient is φ = 113327424.

The previous prime is 291994931. The next prime is 291994943. The reversal of 291994940 is 49499192.

It is a super-2 number, since 2×291994940² = 170522089971207200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (291994943) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 139139 + ... + 141221.

It is an arithmetic number, because the mean of its divisors is an integer number (13158376).

Almost surely, 2^291994940 is an apocalyptic number.

291994940 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 291994940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (315801024).

291994940 is an abundant number, since it is smaller than the sum of its proper divisors (339607108).

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

291994940 is a wasteful number, since it uses less digits than its factorization.

291994940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2298 (or 2296 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 47.

The square root of 291994940 is about 17087.8594329424. The cubic root of 291994940 is about 663.4249115305.

The spelling of 291994940 in words is "two hundred ninety-one million, nine hundred ninety-four thousand, nine hundred forty".