7157420 has 24 divisors (see below), whose sum is σ = 15168384. Its totient is φ = 2836736.

The previous prime is 7157417. The next prime is 7157429. The reversal of 7157420 is 247517.

It is a super-2 number, since 2×7157420² = 102457322112800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7157420.

It is not an unprimeable number, because it can be changed into a prime (7157429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 677 + ... + 3843.

It is an arithmetic number, because the mean of its divisors is an integer number (632016).

Almost surely, 2^7157420 is an apocalyptic number.

It is an amenable number.

7157420 is an abundant number, since it is smaller than the sum of its proper divisors (8010964).

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

7157420 is a wasteful number, since it uses less digits than its factorization.

7157420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3289 (or 3287 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 7157420 is about 2675.3354929803. The cubic root of 7157420 is about 192.7164709363.

Subtracting from 7157420 its reverse (247517), we obtain a triangular number (6909903 = T₃₇₁₇).

The spelling of 7157420 in words is "seven million, one hundred fifty-seven thousand, four hundred twenty".