7157840 has 40 divisors (see below), whose sum is σ = 16793568. Its totient is φ = 2837120.

The previous prime is 7157827. The next prime is 7157849. The reversal of 7157840 is 487517.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 7157797 and 7157806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7157849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10139 + ... + 10821.

Almost surely, 2^7157840 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 7157840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8396784).

7157840 is an abundant number, since it is smaller than the sum of its proper divisors (9635728).

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

7157840 is a wasteful number, since it uses less digits than its factorization.

7157840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 827 (or 821 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 7157840 is about 2675.4139866570. The cubic root of 7157840 is about 192.7202404200.

It can be divided in two parts, 7157 and 840, that added together give a palindrome (7997).

The spelling of 7157840 in words is "seven million, one hundred fifty-seven thousand, eight hundred forty".