6401023 has 4 divisors (see below), whose sum is σ = 6549928. Its totient is φ = 6252120.

The previous prime is 6401011. The next prime is 6401029. The reversal of 6401023 is 3201046.

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 6401023 - 2¹⁷ = 6269951 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6400988 and 6401006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6401029) 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, 74388 + ... + 74473.

It is an arithmetic number, because the mean of its divisors is an integer number (1637482).

Almost surely, 2^6401023 is an apocalyptic number.

6401023 is a deficient number, since it is larger than the sum of its proper divisors (148905).

6401023 is a wasteful number, since it uses less digits than its factorization.

6401023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148904.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 6401023 is about 2530.0243081836. The cubic root of 6401023 is about 185.6734452037.

Adding to 6401023 its reverse (3201046), we get a palindrome (9602069).

The spelling of 6401023 in words is "six million, four hundred one thousand, twenty-three".