1231865852 has 24 divisors (see below), whose sum is σ = 2480056320. Its totient is φ = 524444400.

The previous prime is 1231865801. The next prime is 1231865891. The reversal of 1231865852 is 2585681321.

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, 141452 + ... + 149907.

It is an arithmetic number, because the mean of its divisors is an integer number (103335680).

Almost surely, 2^1231865852 is an apocalyptic number.

It is an amenable number.

1231865852 is an abundant number, since it is smaller than the sum of its proper divisors (1248190468).

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

1231865852 is a wasteful number, since it uses less digits than its factorization.

1231865852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291521 (or 291519 counting only the distinct ones).

The product of its digits is 115200, while the sum is 41.

The square root of 1231865852 is about 35097.9465496202. The cubic root of 1231865852 is about 1071.9827712665.

The spelling of 1231865852 in words is "one billion, two hundred thirty-one million, eight hundred sixty-five thousand, eight hundred fifty-two".