8491940 has 12 divisors (see below), whose sum is σ = 17833116. Its totient is φ = 3396768.

The previous prime is 8491933. The next prime is 8491943. The reversal of 8491940 is 491948.

It can be written as a sum of positive squares in 2 ways, for example, as 1658944 + 6832996 = 1288^2 + 2614^2 .

It is a super-2 number, since 2×8491940² = 144226089927200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 8491940.

It is not an unprimeable number, because it can be changed into a prime (8491943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212279 + ... + 212318.

It is an arithmetic number, because the mean of its divisors is an integer number (1486093).

Almost surely, 2^8491940 is an apocalyptic number.

It is an amenable number.

8491940 is an abundant number, since it is smaller than the sum of its proper divisors (9341176).

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

8491940 is a wasteful number, since it uses less digits than its factorization.

8491940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424606 (or 424604 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 8491940 is about 2914.0933409896. The cubic root of 8491940 is about 204.0182285390.

The spelling of 8491940 in words is "eight million, four hundred ninety-one thousand, nine hundred forty".