15720145 has 16 divisors (see below), whose sum is σ = 21777408. Its totient is φ = 10670400.

The previous prime is 15720101. The next prime is 15720167. The reversal of 15720145 is 54102751.

It is not a de Polignac number, because 15720145 - 2⁹ = 15719633 is a prime.

It is a Duffinian number.

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 15 ways as a sum of consecutive naturals, for example, 1312 + ... + 5758.

It is an arithmetic number, because the mean of its divisors is an integer number (1361088).

Almost surely, 2^15720145 is an apocalyptic number.

It is an amenable number.

15720145 is a deficient number, since it is larger than the sum of its proper divisors (6057263).

15720145 is a wasteful number, since it uses less digits than its factorization.

15720145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4560.

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 15720145 is about 3964.8638059838. The cubic root of 15720145 is about 250.5064134889.

Adding to 15720145 its reverse (54102751), we get a palindrome (69822896).

It can be divided in two parts, 157 and 20145, that added together give a palindrome (20302).

The spelling of 15720145 in words is "fifteen million, seven hundred twenty thousand, one hundred forty-five".