7961405 has 4 divisors (see below), whose sum is σ = 9553692. Its totient is φ = 6369120.

The previous prime is 7961363. The next prime is 7961411. The reversal of 7961405 is 5041697.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3024121 + 4937284 = 1739^2 + 2222^2 .

It is a de Polignac number, because none of the positive numbers 2^k-7961405 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 796136 + ... + 796145.

It is an arithmetic number, because the mean of its divisors is an integer number (2388423).

Almost surely, 2^7961405 is an apocalyptic number.

It is an amenable number.

7961405 is a deficient number, since it is larger than the sum of its proper divisors (1592287).

7961405 is a wasteful number, since it uses less digits than its factorization.

7961405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1592286.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 7961405 is about 2821.5961794701. The cubic root of 7961405 is about 199.6778563961.

The spelling of 7961405 in words is "seven million, nine hundred sixty-one thousand, four hundred five".