15455640 has 96 divisors (see below), whose sum is σ = 48440880. Its totient is φ = 3942144.

The previous prime is 15455623. The next prime is 15455641. The reversal of 15455640 is 4655451.

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 = 15455598 and 15455607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15455641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 261931 + ... + 261989.

Almost surely, 2^15455640 is an apocalyptic number.

15455640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15455640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24220440).

15455640 is an abundant number, since it is smaller than the sum of its proper divisors (32985240).

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

15455640 is a wasteful number, since it uses less digits than its factorization.

15455640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169 (or 106 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 15455640 is about 3931.3661747540. The cubic root of 15455640 is about 249.0934634056.

The spelling of 15455640 in words is "fifteen million, four hundred fifty-five thousand, six hundred forty".