7990000 has 100 divisors (see below), whose sum is σ = 20918304. Its totient is φ = 2944000.

The previous prime is 7989973. The next prime is 7990001. The reversal of 7990000 is 997.

It is a tau number, because it is divible by the number of its divisors (100).

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7990001) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 169977 + ... + 170023.

Almost surely, 2^7990000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7990000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10459152).

7990000 is an abundant number, since it is smaller than the sum of its proper divisors (12928304).

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

7990000 is a wasteful number, since it uses less digits than its factorization.

7990000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92 (or 71 counting only the distinct ones).

The product of its (nonzero) digits is 567, while the sum is 25.

The square root of 7990000 is about 2826.6588050205. The cubic root of 7990000 is about 199.9166319203.

7990000 divided by its sum of digits (25) gives a triangular number (319600 = T₇₉₉).

Adding to 7990000 its reverse (997), we get a palindrome (7990997).

The spelling of 7990000 in words is "seven million, nine hundred ninety thousand".