400042433 has 12 divisors (see below), whose sum is σ = 460426752. Its totient is φ = 340474680.

The previous prime is 400042369. The next prime is 400042441. The reversal of 400042433 is 334240004.

It is a happy number.

It is not a de Polignac number, because 400042433 - 2⁶ = 400042369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400042493) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 731066 + ... + 731612.

It is an arithmetic number, because the mean of its divisors is an integer number (38368896).

Almost surely, 2^400042433 is an apocalyptic number.

It is an amenable number.

400042433 is a deficient number, since it is larger than the sum of its proper divisors (60384319).

400042433 is an frugal number, since it uses more digits than its factorization.

400042433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1292 (or 745 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 20.

The square root of 400042433 is about 20001.0607968678. The cubic root of 400042433 is about 736.8323528916.

Adding to 400042433 its reverse (334240004), we get a palindrome (734282437).

The spelling of 400042433 in words is "four hundred million, forty-two thousand, four hundred thirty-three".