7421881 has 4 divisors (see below), whose sum is σ = 7427700. Its totient is φ = 7416064.

The previous prime is 7421863. The next prime is 7421891. The reversal of 7421881 is 1881247.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1881247 = 19 ⋅99013.

It can be written as a sum of positive squares in 2 ways, for example, as 2205225 + 5216656 = 1485^2 + 2284^2 .

It is a cyclic number.

It is not a de Polignac number, because 7421881 - 2⁵ = 7421849 is a prime.

It is a super-2 number, since 2×7421881² = 110168635156322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7421831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76 + ... + 3853.

It is an arithmetic number, because the mean of its divisors is an integer number (1856925).

Almost surely, 2^7421881 is an apocalyptic number.

It is an amenable number.

7421881 is a deficient number, since it is larger than the sum of its proper divisors (5819).

7421881 is a wasteful number, since it uses less digits than its factorization.

7421881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5818.

The product of its digits is 3584, while the sum is 31.

The square root of 7421881 is about 2724.3129409082. The cubic root of 7421881 is about 195.0613964024.

The spelling of 7421881 in words is "seven million, four hundred twenty-one thousand, eight hundred eighty-one".