7801421 has 4 divisors (see below), whose sum is σ = 7807644. Its totient is φ = 7795200.

The previous prime is 7801379. The next prime is 7801427. The reversal of 7801421 is 1241087.

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.

It can be written as a sum of positive squares in 2 ways, for example, as 2208196 + 5593225 = 1486^2 + 2365^2 .

It is a cyclic number.

It is not a de Polignac number, because 7801421 - 2²² = 3607117 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 (7801427) 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, 500 + ... + 3981.

It is an arithmetic number, because the mean of its divisors is an integer number (1951911).

Almost surely, 2^7801421 is an apocalyptic number.

It is an amenable number.

7801421 is a deficient number, since it is larger than the sum of its proper divisors (6223).

7801421 is a wasteful number, since it uses less digits than its factorization.

7801421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6222.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 7801421 is about 2793.1023969772. The cubic root of 7801421 is about 198.3312907698.

The spelling of 7801421 in words is "seven million, eight hundred one thousand, four hundred twenty-one".