4020091 has 8 divisors (see below), whose sum is σ = 4179168. Its totient is φ = 3864000.

The previous prime is 4020031. The next prime is 4020119. The reversal of 4020091 is 1900204.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 4020091 - 2⁹ = 4019579 is a prime.

It is a super-2 number, since 2×4020091² = 32322263296562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4020011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2221 + ... + 3601.

It is an arithmetic number, because the mean of its divisors is an integer number (522396).

Almost surely, 2^4020091 is an apocalyptic number.

4020091 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

4020091 is a deficient number, since it is larger than the sum of its proper divisors (159077).

4020091 is a wasteful number, since it uses less digits than its factorization.

4020091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1493.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 4020091 is about 2005.0164587853. The cubic root of 4020091 is about 159.0054320890.

Adding to 4020091 its reverse (1900204), we get a palindrome (5920295).

The spelling of 4020091 in words is "four million, twenty thousand, ninety-one".