15994121 has 8 divisors (see below), whose sum is σ = 18790464. Its totient is φ = 13421520.

The previous prime is 15994117. The next prime is 15994123. The reversal of 15994121 is 12149951.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15994121 - 2² = 15994117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15994123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55781 + ... + 56066.

It is an arithmetic number, because the mean of its divisors is an integer number (2348808).

Almost surely, 2^15994121 is an apocalyptic number.

15994121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

15994121 is a deficient number, since it is larger than the sum of its proper divisors (2796343).

15994121 is a wasteful number, since it uses less digits than its factorization.

15994121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111871.

The product of its digits is 3240, while the sum is 32.

The square root of 15994121 is about 3999.2650574824. The cubic root of 15994121 is about 251.9533433821.

The spelling of 15994121 in words is "fifteen million, nine hundred ninety-four thousand, one hundred twenty-one".