1205405 has 6 divisors (see below), whose sum is σ = 1449438. Its totient is φ = 962360.

The previous prime is 1205387. The next prime is 1205411. The reversal of 1205405 is 5045021.

It can be written as a sum of positive squares in only one way, i.e., 964324 + 241081 = 982^2 + 491^2 .

It is not a de Polignac number, because 1205405 - 2¹² = 1201309 is a prime.

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 5 ways as a sum of consecutive naturals, for example, 2210 + ... + 2700.

It is an arithmetic number, because the mean of its divisors is an integer number (241573).

2^1205405 is an apocalyptic number.

It is an amenable number.

1205405 is a deficient number, since it is larger than the sum of its proper divisors (244033).

1205405 is an frugal number, since it uses more digits than its factorization.

1205405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 987 (or 496 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 1205405 is about 1097.9093769524. The cubic root of 1205405 is about 106.4251643516.

The spelling of 1205405 in words is "one million, two hundred five thousand, four hundred five".