400435023 has 4 divisors (see below), whose sum is σ = 533913368. Its totient is φ = 266956680.

The previous prime is 400435019. The next prime is 400435031. The reversal of 400435023 is 320534004.

It is a happy number.

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

It is not a de Polignac number, because 400435023 - 2² = 400435019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400435043) 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, 66739168 + ... + 66739173.

It is an arithmetic number, because the mean of its divisors is an integer number (133478342).

Almost surely, 2^400435023 is an apocalyptic number.

400435023 is a deficient number, since it is larger than the sum of its proper divisors (133478345).

400435023 is a wasteful number, since it uses less digits than its factorization.

400435023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133478344.

The product of its (nonzero) digits is 1440, while the sum is 21.

The square root of 400435023 is about 20010.8726196535. The cubic root of 400435023 is about 737.0733093611.

Adding to 400435023 its reverse (320534004), we get a palindrome (720969027).

The spelling of 400435023 in words is "four hundred million, four hundred thirty-five thousand, twenty-three".