1205730 has 24 divisors (see below), whose sum is σ = 3135132. Its totient is φ = 321504.

The previous prime is 1205717. The next prime is 1205731. The reversal of 1205730 is 375021.

It can be written as a sum of positive squares in 2 ways, for example, as 1046529 + 159201 = 1023^2 + 399^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1205731) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6609 + ... + 6788.

2^1205730 is an apocalyptic number.

1205730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1205730 is an abundant number, since it is smaller than the sum of its proper divisors (1929402).

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

1205730 is a wasteful number, since it uses less digits than its factorization.

1205730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13410 (or 13407 counting only the distinct ones).

The product of its (nonzero) digits is 210, while the sum is 18.

The square root of 1205730 is about 1098.0573755501. The cubic root of 1205730 is about 106.4347282382.

The spelling of 1205730 in words is "one million, two hundred five thousand, seven hundred thirty".