2157547 has 8 divisors (see below), whose sum is σ = 2480096. Its totient is φ = 1838592.

The previous prime is 2157539. The next prime is 2157557. The reversal of 2157547 is 7457512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2157547 - 2³ = 2157539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2157517) 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 7 ways as a sum of consecutive naturals, for example, 553 + ... + 2149.

It is an arithmetic number, because the mean of its divisors is an integer number (310012).

2^2157547 is an apocalyptic number.

2157547 is a deficient number, since it is larger than the sum of its proper divisors (322549).

2157547 is a wasteful number, since it uses less digits than its factorization.

2157547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1797.

The product of its digits is 9800, while the sum is 31.

The square root of 2157547 is about 1468.8590810558. The cubic root of 2157547 is about 129.2171292711.

It can be divided in two parts, 2157 and 547, that added together give a square (2704 = 52²).

The spelling of 2157547 in words is "two million, one hundred fifty-seven thousand, five hundred forty-seven".