4021740 has 36 divisors (see below), whose sum is σ = 12199824. Its totient is φ = 1072416.

The previous prime is 4021739. The next prime is 4021751. The reversal of 4021740 is 471204.

4021740 = T₁₉ + T₂₀ + ... + T₂₈₈.

It is a happy number.

4021740 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nialpdrome in base 6.

It is a zygodrome in base 6.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10992 + ... + 11351.

It is an arithmetic number, because the mean of its divisors is an integer number (338884).

Almost surely, 2^4021740 is an apocalyptic number.

It is an amenable number.

4021740 is an abundant number, since it is smaller than the sum of its proper divisors (8178084).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4021740 is a wasteful number, since it uses less digits than its factorization.

4021740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22358 (or 22353 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 4021740 is about 2005.4276351941. The cubic root of 4021740 is about 159.0271699149.

Adding to 4021740 its reverse (471204), we get a palindrome (4492944).

It can be divided in two parts, 4021 and 740, that added together give a square (4761 = 69²).

The spelling of 4021740 in words is "four million, twenty-one thousand, seven hundred forty".