2145757 has 8 divisors (see below), whose sum is σ = 2294136. Its totient is φ = 1999872.

The previous prime is 2145721. The next prime is 2145763. The reversal of 2145757 is 7575412.

It can be written as a sum of positive squares in 4 ways, for example, as 11236 + 2134521 = 106^2 + 1461^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2145757 - 2⁷ = 2145629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145707) 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, 1363 + ... + 2479.

It is an arithmetic number, because the mean of its divisors is an integer number (286767).

2^2145757 is an apocalyptic number.

It is an amenable number.

2145757 is a deficient number, since it is larger than the sum of its proper divisors (148379).

2145757 is a wasteful number, since it uses less digits than its factorization.

2145757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1247.

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

The square root of 2145757 is about 1464.8402643292. The cubic root of 2145757 is about 128.9813285478.

The spelling of 2145757 in words is "two million, one hundred forty-five thousand, seven hundred fifty-seven".