428920249 has 4 divisors (see below), whose sum is σ = 429055120. Its totient is φ = 428785380.

The previous prime is 428920241. The next prime is 428920259. The reversal of 428920249 is 942029824.

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 428920249 - 2³ = 428920241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428920241) 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, 62547 + ... + 69064.

It is an arithmetic number, because the mean of its divisors is an integer number (107263780).

Almost surely, 2^428920249 is an apocalyptic number.

It is an amenable number.

428920249 is a deficient number, since it is larger than the sum of its proper divisors (134871).

428920249 is a wasteful number, since it uses less digits than its factorization.

428920249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134870.

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 428920249 is about 20710.3898804441. The cubic root of 428920249 is about 754.1519352019.

The spelling of 428920249 in words is "four hundred twenty-eight million, nine hundred twenty thousand, two hundred forty-nine".