1158381 has 28 divisors (see below), whose sum is σ = 1993632. Its totient is φ = 659016.

The previous prime is 1158361. The next prime is 1158383. The reversal of 1158381 is 1838511.

1158381 is a `hidden beast` number, since 1 + 1 + 583 + 81 = 666.

It is not a de Polignac number, because 1158381 - 2⁶ = 1158317 is a prime.

It is a super-2 number, since 2×1158381² = 2683693082322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1158383) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 4990 + ... + 5216.

2^1158381 is an apocalyptic number.

1158381 is the 681-st heptagonal number.

It is an amenable number.

1158381 is a deficient number, since it is larger than the sum of its proper divisors (835251).

1158381 is an frugal number, since it uses more digits than its factorization.

1158381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252 (or 237 counting only the distinct ones).

The product of its digits is 960, while the sum is 27.

The square root of 1158381 is about 1076.2810971117. The cubic root of 1158381 is about 105.0228521690.

It can be divided in two parts, 11583 and 81, that added together give a square (11664 = 108²).

The spelling of 1158381 in words is "one million, one hundred fifty-eight thousand, three hundred eighty-one".