3655998 has 24 divisors (see below), whose sum is σ = 8003736. Its totient is φ = 1206000.

The previous prime is 3655987. The next prime is 3656017. The reversal of 3655998 is 8995563.

3655998 is a `hidden beast` number, since 3 + 6 + 559 + 98 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 813 + ... + 2823.

It is an arithmetic number, because the mean of its divisors is an integer number (333489).

Almost surely, 2^3655998 is an apocalyptic number.

3655998 is an abundant number, since it is smaller than the sum of its proper divisors (4347738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3655998 is a wasteful number, since it uses less digits than its factorization.

3655998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2120 (or 2117 counting only the distinct ones).

The product of its digits is 291600, while the sum is 45.

The square root of 3655998 is about 1912.0664214404. The cubic root of 3655998 is about 154.0524642745.

The spelling of 3655998 in words is "three million, six hundred fifty-five thousand, nine hundred ninety-eight".