15861222 has 24 divisors (see below), whose sum is σ = 37010064. Its totient is φ = 4880304.

The previous prime is 15861203. The next prime is 15861233. The reversal of 15861222 is 22216851.

It is a happy number.

15861222 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33658 + ... + 34125.

It is an arithmetic number, because the mean of its divisors is an integer number (1542086).

Almost surely, 2^15861222 is an apocalyptic number.

15861222 is an abundant number, since it is smaller than the sum of its proper divisors (21148842).

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

15861222 is a wasteful number, since it uses less digits than its factorization.

15861222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67804 (or 67801 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 15861222 is about 3982.6149700919. The cubic root of 15861222 is about 251.2535545647.

The spelling of 15861222 in words is "fifteen million, eight hundred sixty-one thousand, two hundred twenty-two".