3599991 has 16 divisors (see below), whose sum is σ = 5374720. Its totient is φ = 2381400.

The previous prime is 3599969. The next prime is 3600001. The reversal of 3599991 is 1999953.

It is not a de Polignac number, because 3599991 - 2⁶ = 3599927 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 (3599941) 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, 3636 + ... + 4518.

It is an arithmetic number, because the mean of its divisors is an integer number (335920).

Almost surely, 2^3599991 is an apocalyptic number.

3599991 is a deficient number, since it is larger than the sum of its proper divisors (1774729).

3599991 is a wasteful number, since it uses less digits than its factorization.

3599991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1043 (or 1037 counting only the distinct ones).

The product of its digits is 98415, while the sum is 45.

The square root of 3599991 is about 1897.3642243913. The cubic root of 3599991 is about 153.2617587604.

It can be divided in two parts, 359999 and 1, that added together give a square (360000 = 600²).

The spelling of 3599991 in words is "three million, five hundred ninety-nine thousand, nine hundred ninety-one".