15439940 has 12 divisors (see below), whose sum is σ = 32423916. Its totient is φ = 6175968.

The previous prime is 15439937. The next prime is 15439979. The reversal of 15439940 is 4993451.

It can be written as a sum of positive squares in 2 ways, for example, as 2709316 + 12730624 = 1646^2 + 3568^2 .

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 15439940.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 385979 + ... + 386018.

It is an arithmetic number, because the mean of its divisors is an integer number (2701993).

Almost surely, 2^15439940 is an apocalyptic number.

15439940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15439940 is an abundant number, since it is smaller than the sum of its proper divisors (16983976).

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

15439940 is a wasteful number, since it uses less digits than its factorization.

15439940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772006 (or 772004 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 15439940 is about 3929.3689060713. The cubic root of 15439940 is about 249.0090909193.

The spelling of 15439940 in words is "fifteen million, four hundred thirty-nine thousand, nine hundred forty".