15663942 has 80 divisors (see below), whose sum is σ = 42282240. Its totient is φ = 4234032.

The previous prime is 15663941. The next prime is 15663971. The reversal of 15663942 is 24936651.

It is a happy number.

15663942 is a `hidden beast` number, since 1 + 566 + 3 + 94 + 2 = 666.

15663942 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 15663897 and 15663906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15663941) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 21183 + ... + 21909.

It is an arithmetic number, because the mean of its divisors is an integer number (528528).

Almost surely, 2^15663942 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15663942, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21141120).

15663942 is an abundant number, since it is smaller than the sum of its proper divisors (26618298).

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

15663942 is a wasteful number, since it uses less digits than its factorization.

15663942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767 (or 758 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 15663942 is about 3957.7698265564. The cubic root of 15663942 is about 250.2075183635.

The spelling of 15663942 in words is "fifteen million, six hundred sixty-three thousand, nine hundred forty-two".