7920261 has 20 divisors (see below), whose sum is σ = 11907852. Its totient is φ = 5246208.

The previous prime is 7920259. The next prime is 7920287. The reversal of 7920261 is 1620297.

It can be written as a sum of positive squares in 2 ways, for example, as 2232036 + 5688225 = 1494^2 + 2385^2 .

It is not a de Polignac number, because 7920261 - 2¹ = 7920259 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7920251) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 22261 + ... + 22613.

Almost surely, 2^7920261 is an apocalyptic number.

It is an amenable number.

7920261 is a deficient number, since it is larger than the sum of its proper divisors (3987591).

7920261 is a wasteful number, since it uses less digits than its factorization.

7920261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642 (or 633 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 7920261 is about 2814.2958266678. The cubic root of 7920261 is about 199.3332882804. Note that the first 3 decimals are identical.

The spelling of 7920261 in words is "seven million, nine hundred twenty thousand, two hundred sixty-one".