7999740 has 108 divisors (see below), whose sum is σ = 28258776. Its totient is φ = 1826496.

The previous prime is 7999727. The next prime is 7999753. The reversal of 7999740 is 479997.

It is an interprime number because it is at equal distance from previous prime (7999727) and next prime (7999753).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 8367 + ... + 9273.

Almost surely, 2^7999740 is an apocalyptic number.

7999740 is a gapful number since it is divisible by the number (70) 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 7999740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14129388).

7999740 is an abundant number, since it is smaller than the sum of its proper divisors (20259036).

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

7999740 is a wasteful number, since it uses less digits than its factorization.

7999740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 936 (or 924 counting only the distinct ones).

The product of its (nonzero) digits is 142884, while the sum is 45.

The square root of 7999740 is about 2828.3811624320. The cubic root of 7999740 is about 199.9978333099.

The spelling of 7999740 in words is "seven million, nine hundred ninety-nine thousand, seven hundred forty".