1641993 has 16 divisors (see below), whose sum is σ = 2332800. Its totient is φ = 1025024.

The previous prime is 1641971. The next prime is 1642021. The reversal of 1641993 is 3991461.

It is a cyclic number.

It is not a de Polignac number, because 1641993 - 2⁶ = 1641929 is a prime.

It is a super-2 number, since 2×1641993² = 5392282024098, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1641953) 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, 3433 + ... + 3881.

It is an arithmetic number, because the mean of its divisors is an integer number (145800).

2^1641993 is an apocalyptic number.

It is an amenable number.

1641993 is a deficient number, since it is larger than the sum of its proper divisors (690807).

1641993 is a wasteful number, since it uses less digits than its factorization.

1641993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528.

The product of its digits is 5832, while the sum is 33.

The square root of 1641993 is about 1281.4027469925. The cubic root of 1641993 is about 117.9751216344.

The spelling of 1641993 in words is "one million, six hundred forty-one thousand, nine hundred ninety-three".