400011001023 has 16 divisors (see below), whose sum is σ = 538708260096. Its totient is φ = 264006604800.

The previous prime is 400011001009. The next prime is 400011001051. The reversal of 400011001023 is 320100110004.

It is a happy number.

It is not a de Polignac number, because 400011001023 - 2⁴ = 400011001007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400011001003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1465803 + ... + 1717148.

It is an arithmetic number, because the mean of its divisors is an integer number (33669266256).

Almost surely, 2^400011001023 is an apocalyptic number.

400011001023 is a deficient number, since it is larger than the sum of its proper divisors (138697259073).

400011001023 is a wasteful number, since it uses less digits than its factorization.

400011001023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3183374.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 400011001023 its reverse (320100110004), we get a palindrome (720111111027).

The spelling of 400011001023 in words is "four hundred billion, eleven million, one thousand, twenty-three".