15220140 has 144 divisors (see below), whose sum is σ = 49190400. Its totient is φ = 3504384.

The previous prime is 15220133. The next prime is 15220141. The reversal of 15220140 is 4102251.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (15220141) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 192621 + ... + 192699.

It is an arithmetic number, because the mean of its divisors is an integer number (341600).

Almost surely, 2^15220140 is an apocalyptic number.

15220140 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 15220140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24595200).

15220140 is an abundant number, since it is smaller than the sum of its proper divisors (33970260).

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

15220140 is a wasteful number, since it uses less digits than its factorization.

15220140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136 (or 121 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 15220140 is about 3901.2997834055. The cubic root of 15220140 is about 247.8218239796.

Adding to 15220140 its reverse (4102251), we get a palindrome (19322391).

The spelling of 15220140 in words is "fifteen million, two hundred twenty thousand, one hundred forty".