7421520 has 120 divisors (see below), whose sum is σ = 24668064. Its totient is φ = 1845248.

The previous prime is 7421509. The next prime is 7421539. The reversal of 7421520 is 251247.

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×7421520² = 110157918220800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69307 + ... + 69413.

Almost surely, 2^7421520 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 7421520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12334032).

7421520 is an abundant number, since it is smaller than the sum of its proper divisors (17246544).

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

7421520 is a wasteful number, since it uses less digits than its factorization.

7421520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157 (or 134 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 7421520 is about 2724.2466848654. The cubic root of 7421520 is about 195.0582337582.

Adding to 7421520 its reverse (251247), we get a palindrome (7672767).

The spelling of 7421520 in words is "seven million, four hundred twenty-one thousand, five hundred twenty".