1653993 has 16 divisors (see below), whose sum is σ = 2673600. Its totient is φ = 1002240.

The previous prime is 1653989. The next prime is 1653997. The reversal of 1653993 is 3993561.

It is an interprime number because it is at equal distance from previous prime (1653989) and next prime (1653997).

It is not a de Polignac number, because 1653993 - 2² = 1653989 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1653997) 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, 2488 + ... + 3081.

It is an arithmetic number, because the mean of its divisors is an integer number (167100).

2^1653993 is an apocalyptic number.

It is an amenable number.

1653993 is a deficient number, since it is larger than the sum of its proper divisors (1019607).

1653993 is a wasteful number, since it uses less digits than its factorization.

1653993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5589 (or 5583 counting only the distinct ones).

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

The square root of 1653993 is about 1286.0765918094. The cubic root of 1653993 is about 118.2618192949.

The spelling of 1653993 in words is "one million, six hundred fifty-three thousand, nine hundred ninety-three".