1145405 has 4 divisors (see below), whose sum is σ = 1374492. Its totient is φ = 916320.

The previous prime is 1145393. The next prime is 1145411. The reversal of 1145405 is 5045411.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5045411 = 7 ⋅720773.

It can be written as a sum of positive squares in 2 ways, for example, as 219961 + 925444 = 469^2 + 962^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1145405 is a prime.

It is a super-2 number, since 2×1145405² = 2623905228050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114536 + ... + 114545.

It is an arithmetic number, because the mean of its divisors is an integer number (343623).

2^1145405 is an apocalyptic number.

It is an amenable number.

1145405 is a deficient number, since it is larger than the sum of its proper divisors (229087).

1145405 is an equidigital number, since it uses as much as digits as its factorization.

1145405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229086.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 1145405 is about 1070.2359552921. The cubic root of 1145405 is about 104.6292289509.

The spelling of 1145405 in words is "one million, one hundred forty-five thousand, four hundred five".