7977975 has 12 divisors (see below), whose sum is σ = 13190376. Its totient is φ = 4254880.

The previous prime is 7977971. The next prime is 7977989. The reversal of 7977975 is 5797797.

It is a happy number.

It is not a de Polignac number, because 7977975 - 2² = 7977971 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7977971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53112 + ... + 53261.

It is an arithmetic number, because the mean of its divisors is an integer number (1099198).

Almost surely, 2^7977975 is an apocalyptic number.

7977975 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

7977975 is a deficient number, since it is larger than the sum of its proper divisors (5212401).

7977975 is a wasteful number, since it uses less digits than its factorization.

7977975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106386 (or 106381 counting only the distinct ones).

The product of its digits is 972405, while the sum is 51.

The square root of 7977975 is about 2824.5309345093. The cubic root of 7977975 is about 199.8162896375.

The spelling of 7977975 in words is "seven million, nine hundred seventy-seven thousand, nine hundred seventy-five".