4020537 has 4 divisors (see below), whose sum is σ = 5360720. Its totient is φ = 2680356.

The previous prime is 4020529. The next prime is 4020563. The reversal of 4020537 is 7350204.

It is a happy number.

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.

It is not a de Polignac number, because 4020537 - 2³ = 4020529 is a prime.

It is a D-number.

It is a Duffinian number.

4020537 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (4020587) 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, 670087 + ... + 670092.

It is an arithmetic number, because the mean of its divisors is an integer number (1340180).

Almost surely, 2^4020537 is an apocalyptic number.

It is an amenable number.

4020537 is a deficient number, since it is larger than the sum of its proper divisors (1340183).

4020537 is a wasteful number, since it uses less digits than its factorization.

4020537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1340182.

The product of its (nonzero) digits is 840, while the sum is 21.

The square root of 4020537 is about 2005.1276767328. The cubic root of 4020537 is about 159.0113120388.

The spelling of 4020537 in words is "four million, twenty thousand, five hundred thirty-seven".