4020155 has 4 divisors (see below), whose sum is σ = 4824192. Its totient is φ = 3216120.

The previous prime is 4020151. The next prime is 4020157. The reversal of 4020155 is 5510204.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 4020155 - 2² = 4020151 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4020151) 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, 402011 + ... + 402020.

It is an arithmetic number, because the mean of its divisors is an integer number (1206048).

Almost surely, 2^4020155 is an apocalyptic number.

4020155 is a deficient number, since it is larger than the sum of its proper divisors (804037).

4020155 is an equidigital number, since it uses as much as digits as its factorization.

4020155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804036.

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 4020155 is about 2005.0324186905. The cubic root of 4020155 is about 159.0062758753.

Adding to 4020155 its reverse (5510204), we get a palindrome (9530359).

The spelling of 4020155 in words is "four million, twenty thousand, one hundred fifty-five".