4020787 has 4 divisors (see below), whose sum is σ = 4024800. Its totient is φ = 4016776.

The previous prime is 4020781. The next prime is 4020833. The reversal of 4020787 is 7870204.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 4020787 - 2¹¹ = 4018739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4020781) 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 3 ways as a sum of consecutive naturals, for example, 918 + ... + 2980.

It is an arithmetic number, because the mean of its divisors is an integer number (1006200).

Almost surely, 2^4020787 is an apocalyptic number.

4020787 is a deficient number, since it is larger than the sum of its proper divisors (4013).

4020787 is a wasteful number, since it uses less digits than its factorization.

4020787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4012.

The product of its (nonzero) digits is 3136, while the sum is 28.

The square root of 4020787 is about 2005.1900159337. The cubic root of 4020787 is about 159.0146077846.

The spelling of 4020787 in words is "four million, twenty thousand, seven hundred eighty-seven".