15720140 has 24 divisors (see below), whose sum is σ = 33108432. Its totient is φ = 6269760.

The previous prime is 15720101. The next prime is 15720167. The reversal of 15720140 is 4102751.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7487 + ... + 9353.

It is an arithmetic number, because the mean of its divisors is an integer number (1379518).

Almost surely, 2^15720140 is an apocalyptic number.

15720140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15720140 is an abundant number, since it is smaller than the sum of its proper divisors (17388292).

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

15720140 is a wasteful number, since it uses less digits than its factorization.

15720140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2297 (or 2295 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 15720140 is about 3964.8631754450. The cubic root of 15720140 is about 250.5063869299.

Adding to 15720140 its reverse (4102751), we get a palindrome (19822891).

The spelling of 15720140 in words is "fifteen million, seven hundred twenty thousand, one hundred forty".