7421861 has 8 divisors (see below), whose sum is σ = 7657944. Its totient is φ = 7188480.

The previous prime is 7421857. The next prime is 7421863. The reversal of 7421861 is 1681247.

It can be written as a sum of positive squares in 4 ways, for example, as 185761 + 7236100 = 431^2 + 2690^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7421861 - 2² = 7421857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7421863) 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, 5861 + ... + 7013.

It is an arithmetic number, because the mean of its divisors is an integer number (957243).

Almost surely, 2^7421861 is an apocalyptic number.

It is an amenable number.

7421861 is a deficient number, since it is larger than the sum of its proper divisors (236083).

7421861 is a wasteful number, since it uses less digits than its factorization.

7421861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1351.

The product of its digits is 2688, while the sum is 29.

The square root of 7421861 is about 2724.3092702555. The cubic root of 7421861 is about 195.0612211893.

The spelling of 7421861 in words is "seven million, four hundred twenty-one thousand, eight hundred sixty-one".