428023117 has 4 divisors (see below), whose sum is σ = 431102560. Its totient is φ = 424943676.

The previous prime is 428023103. The next prime is 428023129. The reversal of 428023117 is 711320824.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 428023117 - 2¹⁹ = 427498829 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 (428023157) 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, 1539513 + ... + 1539790.

It is an arithmetic number, because the mean of its divisors is an integer number (107775640).

Almost surely, 2^428023117 is an apocalyptic number.

It is an amenable number.

428023117 is a deficient number, since it is larger than the sum of its proper divisors (3079443).

428023117 is a wasteful number, since it uses less digits than its factorization.

428023117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3079442.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 428023117 is about 20688.7195592187. The cubic root of 428023117 is about 753.6257720493.

The spelling of 428023117 in words is "four hundred twenty-eight million, twenty-three thousand, one hundred seventeen".