402042023 has 4 divisors (see below), whose sum is σ = 411847968. Its totient is φ = 392236080.

The previous prime is 402042019. The next prime is 402042029. The reversal of 402042023 is 320240204.

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

It is a cyclic number.

It is not a de Polignac number, because 402042023 - 2² = 402042019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 402041992 and 402042010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402042029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4902911 + ... + 4902992.

It is an arithmetic number, because the mean of its divisors is an integer number (102961992).

Almost surely, 2^402042023 is an apocalyptic number.

402042023 is a deficient number, since it is larger than the sum of its proper divisors (9805945).

402042023 is an equidigital number, since it uses as much as digits as its factorization.

402042023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9805944.

The product of its (nonzero) digits is 384, while the sum is 17.

The square root of 402042023 is about 20050.9855867486. The cubic root of 402042023 is about 738.0579850053.

Adding to 402042023 its reverse (320240204), we get a palindrome (722282227).

The spelling of 402042023 in words is "four hundred two million, forty-two thousand, twenty-three".