2850721 has 4 divisors (see below), whose sum is σ = 2890944. Its totient is φ = 2810500.

The previous prime is 2850719. The next prime is 2850737. The reversal of 2850721 is 1270582.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1270582 = 2 ⋅635291.

It is a cyclic number.

It is not a de Polignac number, because 2850721 - 2¹ = 2850719 is a prime.

It is a super-2 number, since 2×2850721² = 16253220439682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2850761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20005 + ... + 20146.

It is an arithmetic number, because the mean of its divisors is an integer number (722736).

2^2850721 is an apocalyptic number.

It is an amenable number.

2850721 is a deficient number, since it is larger than the sum of its proper divisors (40223).

2850721 is an equidigital number, since it uses as much as digits as its factorization.

2850721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40222.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 2850721 is about 1688.4078298800. The cubic root of 2850721 is about 141.7919488441.

The spelling of 2850721 in words is "two million, eight hundred fifty thousand, seven hundred twenty-one".