4021749 has 24 divisors (see below), whose sum is σ = 6333600. Its totient is φ = 2449440.

The previous prime is 4021739. The next prime is 4021751. The reversal of 4021749 is 9471204.

It is a happy number.

It is not a de Polignac number, because 4021749 - 2⁴ = 4021733 is a prime.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4021739) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4554 + ... + 5364.

It is an arithmetic number, because the mean of its divisors is an integer number (263900).

Almost surely, 2^4021749 is an apocalyptic number.

It is an amenable number.

4021749 is a deficient number, since it is larger than the sum of its proper divisors (2311851).

4021749 is a wasteful number, since it uses less digits than its factorization.

4021749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865 (or 862 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 4021749 is about 2005.4298791032. The cubic root of 4021749 is about 159.0272885405.

The spelling of 4021749 in words is "four million, twenty-one thousand, seven hundred forty-nine".