7987405 has 16 divisors (see below), whose sum is σ = 9860544. Its totient is φ = 6209280.

The previous prime is 7987403. The next prime is 7987423. The reversal of 7987405 is 5047897.

7987405 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 7987405 - 2¹ = 7987403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7987403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37750 + ... + 37960.

It is an arithmetic number, because the mean of its divisors is an integer number (616284).

Almost surely, 2^7987405 is an apocalyptic number.

It is an amenable number.

7987405 is a deficient number, since it is larger than the sum of its proper divisors (1873139).

7987405 is a wasteful number, since it uses less digits than its factorization.

7987405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396.

The product of its (nonzero) digits is 70560, while the sum is 40.

The square root of 7987405 is about 2826.1997452409. The cubic root of 7987405 is about 199.8949865372.

The spelling of 7987405 in words is "seven million, nine hundred eighty-seven thousand, four hundred five".