1993851 has 6 divisors (see below), whose sum is σ = 2880020. Its totient is φ = 1329228.

The previous prime is 1993829. The next prime is 1993861. The reversal of 1993851 is 1583991.

It is a happy number.

It is not a de Polignac number, because 1993851 - 2⁹ = 1993339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1993861) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 110761 + ... + 110778.

2^1993851 is an apocalyptic number.

1993851 is a deficient number, since it is larger than the sum of its proper divisors (886169).

1993851 is a wasteful number, since it uses less digits than its factorization.

1993851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221545 (or 221542 counting only the distinct ones).

The product of its digits is 9720, while the sum is 36.

The square root of 1993851 is about 1412.0378890101. The cubic root of 1993851 is about 125.8628515267.

The spelling of 1993851 in words is "one million, nine hundred ninety-three thousand, eight hundred fifty-one".