7707421 has 4 divisors (see below), whose sum is σ = 7739644. Its totient is φ = 7675200.

The previous prime is 7707397. The next prime is 7707431. The reversal of 7707421 is 1247077.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1247077 = 13 ⋅95929.

It can be written as a sum of positive squares in 2 ways, for example, as 2805625 + 4901796 = 1675^2 + 2214^2 .

It is a cyclic number.

It is not a de Polignac number, because 7707421 - 2¹³ = 7699229 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7707421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7707431) 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, 15750 + ... + 16231.

It is an arithmetic number, because the mean of its divisors is an integer number (1934911).

Almost surely, 2^7707421 is an apocalyptic number.

It is an amenable number.

7707421 is a deficient number, since it is larger than the sum of its proper divisors (32223).

7707421 is a wasteful number, since it uses less digits than its factorization.

7707421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32222.

The product of its (nonzero) digits is 2744, while the sum is 28.

The square root of 7707421 is about 2776.2242344595. The cubic root of 7707421 is about 197.5314995424.

It can be divided in two parts, 7707 and 421, that added together give a triangular number (8128 = T₁₂₇).

The spelling of 7707421 in words is "seven million, seven hundred seven thousand, four hundred twenty-one".