7131840 has 224 divisors, whose sum is σ = 26334720. Its totient is φ = 1622016.

The previous prime is 7131797. The next prime is 7131841. The reversal of 7131840 is 481317.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 7131840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7131841) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 310069 + ... + 310091.

Almost surely, 2^7131840 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 7131840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13167360).

7131840 is an abundant number, since it is smaller than the sum of its proper divisors (19202880).

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

7131840 is a wasteful number, since it uses less digits than its factorization.

7131840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79 (or 69 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 7131840 is about 2670.5505050457. The cubic root of 7131840 is about 192.4866128881.

The spelling of 7131840 in words is "seven million, one hundred thirty-one thousand, eight hundred forty".