15506940 has 24 divisors (see below), whose sum is σ = 43419600. Its totient is φ = 4135168.

The previous prime is 15506927. The next prime is 15506947. The reversal of 15506940 is 4960551.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 15506898 and 15506907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15506947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129165 + ... + 129284.

It is an arithmetic number, because the mean of its divisors is an integer number (1809150).

Almost surely, 2^15506940 is an apocalyptic number.

15506940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15506940 is an abundant number, since it is smaller than the sum of its proper divisors (27912660).

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

15506940 is a wasteful number, since it uses less digits than its factorization.

15506940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258461 (or 258459 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 15506940 is about 3937.8852192516. The cubic root of 15506940 is about 249.3687541227.

The spelling of 15506940 in words is "fifteen million, five hundred six thousand, nine hundred forty".