1306205404 has 24 divisors (see below), whose sum is σ = 2766083040. Its totient is φ = 526872576.

The previous prime is 1306205393. The next prime is 1306205437. The reversal of 1306205404 is 4045026031.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1371589 + ... + 1372540.

It is an arithmetic number, because the mean of its divisors is an integer number (115253460).

Almost surely, 2^1306205404 is an apocalyptic number.

1306205404 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1306205404 is an abundant number, since it is smaller than the sum of its proper divisors (1459877636).

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

1306205404 is a wasteful number, since it uses less digits than its factorization.

1306205404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2744157 (or 2744155 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 1306205404 is about 36141.4637777719. The cubic root of 1306205404 is about 1093.1266744128.

The spelling of 1306205404 in words is "one billion, three hundred six million, two hundred five thousand, four hundred four".