7421620 has 24 divisors (see below), whose sum is σ = 15639624. Its totient is φ = 2958336.

The previous prime is 7421587. The next prime is 7421633. The reversal of 7421620 is 261247.

It can be written as a sum of positive squares in 4 ways, for example, as 898704 + 6522916 = 948^2 + 2554^2 .

It is a zygodrome in base 3.

It is a junction number, because it is equal to n+sod(n) for n = 7421591 and 7421600.

It is a congruent number.

It is an unprimeable number.

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, 8232 + ... + 9088.

It is an arithmetic number, because the mean of its divisors is an integer number (651651).

Almost surely, 2^7421620 is an apocalyptic number.

It is an amenable number.

7421620 is an abundant number, since it is smaller than the sum of its proper divisors (8218004).

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

7421620 is a wasteful number, since it uses less digits than its factorization.

7421620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1299 (or 1297 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 7421620 is about 2724.2650385012. The cubic root of 7421620 is about 195.0591098472.

Adding to 7421620 its reverse (261247), we get a palindrome (7682867).

The spelling of 7421620 in words is "seven million, four hundred twenty-one thousand, six hundred twenty".