15994120 has 16 divisors (see below), whose sum is σ = 35986860. Its totient is φ = 6397632.

The previous prime is 15994117. The next prime is 15994123. The reversal of 15994120 is 2149951.

It is an interprime number because it is at equal distance from previous prime (15994117) and next prime (15994123).

It can be written as a sum of positive squares in 2 ways, for example, as 15413476 + 580644 = 3926^2 + 762^2 .

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 3 ways as a sum of consecutive naturals, for example, 199887 + ... + 199966.

Almost surely, 2^15994120 is an apocalyptic number.

15994120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15994120 is an abundant number, since it is smaller than the sum of its proper divisors (19992740).

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

15994120 is a wasteful number, since it uses less digits than its factorization.

15994120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399864 (or 399860 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 15994120 is about 3999.2649324595. The cubic root of 15994120 is about 251.9533381311.

The spelling of 15994120 in words is "fifteen million, nine hundred ninety-four thousand, one hundred twenty".