3561993 has 24 divisors (see below), whose sum is σ = 5630976. Its totient is φ = 2160000.

The previous prime is 3561977. The next prime is 3561997. The reversal of 3561993 is 3991653.

3561993 is a `hidden beast` number, since 3 + 561 + 9 + 93 = 666.

It is not a de Polignac number, because 3561993 - 2⁴ = 3561977 is a prime.

3561993 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3561997) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4368 + ... + 5118.

It is an arithmetic number, because the mean of its divisors is an integer number (234624).

Almost surely, 2^3561993 is an apocalyptic number.

It is an amenable number.

3561993 is a deficient number, since it is larger than the sum of its proper divisors (2068983).

3561993 is a wasteful number, since it uses less digits than its factorization.

3561993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805 (or 802 counting only the distinct ones).

The product of its digits is 21870, while the sum is 36.

The square root of 3561993 is about 1887.3242964578. The cubic root of 3561993 is about 152.7206230678.

It can be divided in two parts, 3561 and 993, that added together give a palindrome (4554).

The spelling of 3561993 in words is "three million, five hundred sixty-one thousand, nine hundred ninety-three".