1081993 has 16 divisors (see below), whose sum is σ = 1290240. Its totient is φ = 896400.

The previous prime is 1081981. The next prime is 1082017. The reversal of 1081993 is 3991801.

It is a cyclic number.

It is not a de Polignac number, because 1081993 - 2¹⁷ = 950921 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1081793) 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, 6396 + ... + 6562.

It is an arithmetic number, because the mean of its divisors is an integer number (80640).

2^1081993 is an apocalyptic number.

It is an amenable number.

1081993 is a deficient number, since it is larger than the sum of its proper divisors (208247).

1081993 is a wasteful number, since it uses less digits than its factorization.

1081993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 1081993 is about 1040.1889251477. The cubic root of 1081993 is about 102.6616287984.

The spelling of 1081993 in words is "one million, eighty-one thousand, nine hundred ninety-three".