15440138 has 16 divisors (see below), whose sum is σ = 26520000. Its totient is φ = 6604416.

The previous prime is 15440129. The next prime is 15440143. The reversal of 15440138 is 83104451.

15440138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×15440138² = 476795722918088, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11738 + ... + 12986.

It is an arithmetic number, because the mean of its divisors is an integer number (1657500).

Almost surely, 2^15440138 is an apocalyptic number.

15440138 is a deficient number, since it is larger than the sum of its proper divisors (11079862).

15440138 is a wasteful number, since it uses less digits than its factorization.

15440138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2141.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 15440138 is about 3929.3941008761. The cubic root of 15440138 is about 249.0101553360.

Adding to 15440138 its reverse (83104451), we get a palindrome (98544589).

The spelling of 15440138 in words is "fifteen million, four hundred forty thousand, one hundred thirty-eight".