15998436 has 18 divisors (see below), whose sum is σ = 40440582. Its totient is φ = 5332800.

The previous prime is 15998429. The next prime is 15998443. The reversal of 15998436 is 63489951.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (15998429) and next prime (15998443).

It can be written as a sum of positive squares in only one way, i.e., 15444900 + 553536 = 3930^2 + 744^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a junction number, because it is equal to n+sod(n) for n = 15998391 and 15998400.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 222165 + ... + 222236.

It is an arithmetic number, because the mean of its divisors is an integer number (2246699).

Almost surely, 2^15998436 is an apocalyptic number.

It is an amenable number.

15998436 is an abundant number, since it is smaller than the sum of its proper divisors (24442146).

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

15998436 is a wasteful number, since it uses less digits than its factorization.

15998436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444411 (or 444406 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 15998436 is about 3999.8044952222. The cubic root of 15998436 is about 251.9759992259.

The spelling of 15998436 in words is "fifteen million, nine hundred ninety-eight thousand, four hundred thirty-six".