642433453 has 8 divisors (see below), whose sum is σ = 686340320. Its totient is φ = 599536080.

The previous prime is 642433409. The next prime is 642433471. The reversal of 642433453 is 354334246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 642433453 - 2¹³ = 642425261 is a prime.

It is a super-3 number, since 3×642433453³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642433403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 251058 + ... + 253603.

It is an arithmetic number, because the mean of its divisors is an integer number (85792540).

Almost surely, 2^642433453 is an apocalyptic number.

It is an amenable number.

642433453 is a deficient number, since it is larger than the sum of its proper divisors (43906867).

642433453 is a wasteful number, since it uses less digits than its factorization.

642433453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504747.

The product of its digits is 103680, while the sum is 34.

The square root of 642433453 is about 25346.2709880566. The cubic root of 642433453 is about 862.8647270169.

Adding to 642433453 its reverse (354334246), we get a palindrome (996767699).

The spelling of 642433453 in words is "six hundred forty-two million, four hundred thirty-three thousand, four hundred fifty-three".