4020123 has 4 divisors (see below), whose sum is σ = 5360168. Its totient is φ = 2680080.

The previous prime is 4020119. The next prime is 4020139. The reversal of 4020123 is 3210204.

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

It is not a de Polignac number, because 4020123 - 2² = 4020119 is a prime.

It is a super-2 number, since 2×4020123² = 32322777870258, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

4020123 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 4020099 and 4020108.

It is not an unprimeable number, because it can be changed into a prime (4020223) 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, 670018 + ... + 670023.

It is an arithmetic number, because the mean of its divisors is an integer number (1340042).

Almost surely, 2^4020123 is an apocalyptic number.

4020123 is a deficient number, since it is larger than the sum of its proper divisors (1340045).

4020123 is a wasteful number, since it uses less digits than its factorization.

4020123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1340044.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 4020123 is about 2005.0244387538. The cubic root of 4020123 is about 159.0058539833.

Adding to 4020123 its reverse (3210204), we get a palindrome (7230327).

The spelling of 4020123 in words is "four million, twenty thousand, one hundred twenty-three".