420400433 has 4 divisors (see below), whose sum is σ = 420683508. Its totient is φ = 420117360.

The previous prime is 420400427. The next prime is 420400451. The reversal of 420400433 is 334004024.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 334597264 + 85803169 = 18292^2 + 9263^2 .

It is a cyclic number.

It is not a de Polignac number, because 420400433 - 2⁶ = 420400369 is a prime.

It is a super-3 number, since 3×420400433³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420400933) 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, 139298 + ... + 142283.

It is an arithmetic number, because the mean of its divisors is an integer number (105170877).

Almost surely, 2^420400433 is an apocalyptic number.

It is an amenable number.

420400433 is a deficient number, since it is larger than the sum of its proper divisors (283075).

420400433 is a wasteful number, since it uses less digits than its factorization.

420400433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283074.

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

The square root of 420400433 is about 20503.6687692715. The cubic root of 420400433 is about 749.1251624610.

Adding to 420400433 its reverse (334004024), we get a palindrome (754404457).

The spelling of 420400433 in words is "four hundred twenty million, four hundred thousand, four hundred thirty-three".