396638677 has 4 divisors (see below), whose sum is σ = 399165196. Its totient is φ = 394112160.

The previous prime is 396638663. The next prime is 396638717. The reversal of 396638677 is 776836693.

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 53129521 + 343509156 = 7289^2 + 18534^2 .

It is a cyclic number.

It is not a de Polignac number, because 396638677 - 2¹¹ = 396636629 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 (396638647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1263024 + ... + 1263337.

It is an arithmetic number, because the mean of its divisors is an integer number (99791299).

Almost surely, 2^396638677 is an apocalyptic number.

It is an amenable number.

396638677 is a deficient number, since it is larger than the sum of its proper divisors (2526519).

396638677 is a wasteful number, since it uses less digits than its factorization.

396638677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2526518.

The product of its digits is 6858432, while the sum is 55.

The square root of 396638677 is about 19915.7896403833. The cubic root of 396638677 is about 734.7366215073.

The spelling of 396638677 in words is "three hundred ninety-six million, six hundred thirty-eight thousand, six hundred seventy-seven".