7977145 has 16 divisors (see below), whose sum is σ = 10688832. Its totient is φ = 5664960.

The previous prime is 7977143. The next prime is 7977149. The reversal of 7977145 is 5417797.

It is not a de Polignac number, because 7977145 - 2¹ = 7977143 is a prime.

7977145 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 7977098 and 7977107.

It is not an unprimeable number, because it can be changed into a prime (7977143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 679 + ... + 4051.

It is an arithmetic number, because the mean of its divisors is an integer number (668052).

Almost surely, 2^7977145 is an apocalyptic number.

It is an amenable number.

7977145 is a deficient number, since it is larger than the sum of its proper divisors (2711687).

7977145 is a wasteful number, since it uses less digits than its factorization.

7977145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3432.

The product of its digits is 61740, while the sum is 40.

The square root of 7977145 is about 2824.3840036369. The cubic root of 7977145 is about 199.8093600064.

The spelling of 7977145 in words is "seven million, nine hundred seventy-seven thousand, one hundred forty-five".