642827903 has 4 divisors (see below), whose sum is σ = 644312928. Its totient is φ = 641342880.

The previous prime is 642827839. The next prime is 642827917. The reversal of 642827903 is 309728246.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 309728246 = 2 ⋅154864123.

It is a cyclic number.

It is not a de Polignac number, because 642827903 - 2⁶ = 642827839 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 (642827963) 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, 741863 + ... + 742728.

It is an arithmetic number, because the mean of its divisors is an integer number (161078232).

Almost surely, 2^642827903 is an apocalyptic number.

642827903 is a deficient number, since it is larger than the sum of its proper divisors (1485025).

642827903 is a wasteful number, since it uses less digits than its factorization.

642827903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1485024.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 642827903 is about 25354.0510175396. The cubic root of 642827903 is about 863.0412886798.

The spelling of 642827903 in words is "six hundred forty-two million, eight hundred twenty-seven thousand, nine hundred three".