2157544 has 24 divisors (see below), whose sum is σ = 4178790. Its totient is φ = 1044288.

The previous prime is 2157539. The next prime is 2157557. The reversal of 2157544 is 4457512.

2157544 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 1855044 + 302500 = 1362^2 + 550^2 .

It is a super-2 number, since 2×2157544² = 9309992223872, which contains 22 as substring.

It is an Ulam number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10854 + ... + 11050.

2^2157544 is an apocalyptic number.

It is an amenable number.

2157544 is a deficient number, since it is larger than the sum of its proper divisors (2021246).

2157544 is a wasteful number, since it uses less digits than its factorization.

2157544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277 (or 236 counting only the distinct ones).

The product of its digits is 5600, while the sum is 28.

The square root of 2157544 is about 1468.8580598547. The cubic root of 2157544 is about 129.2170693803.

Subtracting 2157544 from its reverse (4457512), we obtain a cube (2299968 = 132³).

It can be divided in two parts, 2157 and 544, that added together give a triangular number (2701 = T₇₃).

The spelling of 2157544 in words is "two million, one hundred fifty-seven thousand, five hundred forty-four".