1161405 has 32 divisors (see below), whose sum is σ = 2361600. Its totient is φ = 530496.

The previous prime is 1161403. The next prime is 1161437. The reversal of 1161405 is 5041611.

It is not a de Polignac number, because 1161405 - 2¹ = 1161403 is a prime.

It is a plaindrome in base 14.

It is a zygodrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161401) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 331 + ... + 1559.

It is an arithmetic number, because the mean of its divisors is an integer number (73800).

2^1161405 is an apocalyptic number.

1161405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1161405 is an abundant number, since it is smaller than the sum of its proper divisors (1200195).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1161405 is a wasteful number, since it uses less digits than its factorization.

1161405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1250 (or 1244 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 1161405 is about 1077.6850189179. The cubic root of 1161405 is about 105.1141615468.

It can be divided in two parts, 116 and 1405, that added together give a square (1521 = 39²).

The spelling of 1161405 in words is "one million, one hundred sixty-one thousand, four hundred five".