7977406 has 4 divisors (see below), whose sum is σ = 11966112. Its totient is φ = 3988702.

The previous prime is 7977353. The next prime is 7977433. The reversal of 7977406 is 6047797.

It is a happy number.

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

It is a super-4 number, since 4×7977406⁴ (a number of 29 digits) contains 4444 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1994350 + ... + 1994353.

It is an arithmetic number, because the mean of its divisors is an integer number (2991528).

Almost surely, 2^7977406 is an apocalyptic number.

7977406 is a deficient number, since it is larger than the sum of its proper divisors (3988706).

7977406 is a wasteful number, since it uses less digits than its factorization.

7977406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3988705.

The product of its (nonzero) digits is 74088, while the sum is 40.

The square root of 7977406 is about 2824.4302080243. The cubic root of 7977406 is about 199.8115391350.

The spelling of 7977406 in words is "seven million, nine hundred seventy-seven thousand, four hundred six".