1205540023 has 8 divisors (see below), whose sum is σ = 1282081392. Its totient is φ = 1129623936.

The previous prime is 1205539991. The next prime is 1205540029. The reversal of 1205540023 is 3200455021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1205540023 - 2⁵ = 1205539991 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1205539976 and 1205540003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1205540029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152340 + ... + 160057.

It is an arithmetic number, because the mean of its divisors is an integer number (160260174).

Almost surely, 2^1205540023 is an apocalyptic number.

1205540023 is a deficient number, since it is larger than the sum of its proper divisors (76541369).

1205540023 is a wasteful number, since it uses less digits than its factorization.

1205540023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312641.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 1205540023 is about 34720.8874166545. The cubic root of 1205540023 is about 1064.2913792848.

Adding to 1205540023 its reverse (3200455021), we get a palindrome (4405995044).

The spelling of 1205540023 in words is "one billion, two hundred five million, five hundred forty thousand, twenty-three".