15641240 has 16 divisors (see below), whose sum is σ = 35192880. Its totient is φ = 6256480.

The previous prime is 15641239. The next prime is 15641251. The reversal of 15641240 is 4214651.

It is a nialpdrome in base 16.

It is a congruent number.

It is an unprimeable number.

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, 195476 + ... + 195555.

It is an arithmetic number, because the mean of its divisors is an integer number (2199555).

Almost surely, 2^15641240 is an apocalyptic number.

15641240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15641240 is an abundant number, since it is smaller than the sum of its proper divisors (19551640).

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

15641240 is a wasteful number, since it uses less digits than its factorization.

15641240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391042 (or 391038 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 15641240 is about 3954.9007572884. The cubic root of 15641240 is about 250.0865833432.

Adding to 15641240 its reverse (4214651), we get a palindrome (19855891).

The spelling of 15641240 in words is "fifteen million, six hundred forty-one thousand, two hundred forty".