15122640 has 160 divisors (see below), whose sum is σ = 52246656. Its totient is φ = 3594240.

The previous prime is 15122633. The next prime is 15122641. The reversal of 15122640 is 4622151.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15122641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 115375 + ... + 115505.

Almost surely, 2^15122640 is an apocalyptic number.

15122640 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 15122640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26123328).

15122640 is an abundant number, since it is smaller than the sum of its proper divisors (37124016).

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

15122640 is a wasteful number, since it uses less digits than its factorization.

15122640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197 (or 191 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 15122640 is about 3888.7838715979. The cubic root of 15122640 is about 247.2915089409.

Adding to 15122640 its reverse (4622151), we get a palindrome (19744791).

It can be divided in two parts, 151 and 22640, that added together give a triangular number (22791 = T₂₁₃).

The spelling of 15122640 in words is "fifteen million, one hundred twenty-two thousand, six hundred forty".