7840998 has 36 divisors (see below), whose sum is σ = 18626868. Its totient is φ = 2364120.

The previous prime is 7840997. The next prime is 7841021. The reversal of 7840998 is 8990487.

It is a super-2 number, since 2×7840998² = 122962499272008, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7840997) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 39303 + ... + 39501.

It is an arithmetic number, because the mean of its divisors is an integer number (517413).

Almost surely, 2^7840998 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7840998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9313434).

7840998 is an abundant number, since it is smaller than the sum of its proper divisors (10785870).

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

7840998 is a wasteful number, since it uses less digits than its factorization.

7840998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417 (or 215 counting only the distinct ones).

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

The square root of 7840998 is about 2800.1782086146. The cubic root of 7840998 is about 198.6661067554. Note that the first 3 decimals are identical.

The spelling of 7840998 in words is "seven million, eight hundred forty thousand, nine hundred ninety-eight".