1305212136 has 32 divisors (see below), whose sum is σ = 3271273440. Its totient is φ = 433971648.

The previous prime is 1305212113. The next prime is 1305212141. The reversal of 1305212136 is 6312125031.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 58966 + ... + 78021.

It is an arithmetic number, because the mean of its divisors is an integer number (102227295).

Almost surely, 2^1305212136 is an apocalyptic number.

It is an amenable number.

1305212136 is an abundant number, since it is smaller than the sum of its proper divisors (1966061304).

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

1305212136 is a wasteful number, since it uses less digits than its factorization.

1305212136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137393 (or 137389 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 1305212136 is about 36127.7197730496. The cubic root of 1305212136 is about 1092.8495247719.

Adding to 1305212136 its reverse (6312125031), we get a palindrome (7617337167).

The spelling of 1305212136 in words is "one billion, three hundred five million, two hundred twelve thousand, one hundred thirty-six".