861252406 has 32 divisors (see below), whose sum is σ = 1555868160. Its totient is φ = 349292736.

The previous prime is 861252397. The next prime is 861252409. The reversal of 861252406 is 604252168.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861252409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 465375 + ... + 467221.

It is an arithmetic number, because the mean of its divisors is an integer number (48620880).

Almost surely, 2^861252406 is an apocalyptic number.

861252406 is a deficient number, since it is larger than the sum of its proper divisors (694615754).

861252406 is a wasteful number, since it uses less digits than its factorization.

861252406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3628.

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 861252406 is about 29347.1021738093. The cubic root of 861252406 is about 951.4299448055.

The spelling of 861252406 in words is "eight hundred sixty-one million, two hundred fifty-two thousand, four hundred six".