8947890 has 72 divisors (see below), whose sum is σ = 27076140. Its totient is φ = 2044224.

The previous prime is 8947889. The next prime is 8947891. The reversal of 8947890 is 987498.

It is an interprime number because it is at equal distance from previous prime (8947889) and next prime (8947891).

It can be written as a sum of positive squares in 2 ways, for example, as 8277129 + 670761 = 2877^2 + 819^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (8947891) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3396 + ... + 5424.

Almost surely, 2^8947890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8947890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13538070).

8947890 is an abundant number, since it is smaller than the sum of its proper divisors (18128250).

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

8947890 is a wasteful number, since it uses less digits than its factorization.

8947890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2056 (or 2046 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 8947890 is about 2991.3023919357. The cubic root of 8947890 is about 207.6061488149.

The spelling of 8947890 in words is "eight million, nine hundred forty-seven thousand, eight hundred ninety".