15900042 has 8 divisors (see below), whose sum is σ = 31800096. Its totient is φ = 5300012.

The previous prime is 15900041. The next prime is 15900043. The reversal of 15900042 is 24000951.

It is an interprime number because it is at equal distance from previous prime (15900041) and next prime (15900043).

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

15900042 is an admirable number.

It is a super-2 number, since 2×15900042² = 505622671203528, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 15899991 and 15900018.

It is not an unprimeable number, because it can be changed into a prime (15900041) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1324998 + ... + 1325009.

It is an arithmetic number, because the mean of its divisors is an integer number (3975012).

Almost surely, 2^15900042 is an apocalyptic number.

15900042 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

15900042 is a wasteful number, since it uses less digits than its factorization.

15900042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2650012.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 15900042 is about 3987.4856739555. The cubic root of 15900042 is about 251.4583667895.

Adding to 15900042 its reverse (24000951), we get a palindrome (39900993).

The spelling of 15900042 in words is "fifteen million, nine hundred thousand, forty-two".