428913381 has 12 divisors (see below), whose sum is σ = 619260288. Its totient is φ = 263946384.

The previous prime is 428913379. The next prime is 428913389. The reversal of 428913381 is 183319824.

It is not a de Polignac number, because 428913381 - 2¹ = 428913379 is a prime.

It is a super-2 number, since 2×428913381² = 367933376801702322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428913389) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 422485 + ... + 423498.

It is an arithmetic number, because the mean of its divisors is an integer number (51605024).

Almost surely, 2^428913381 is an apocalyptic number.

It is an amenable number.

428913381 is a deficient number, since it is larger than the sum of its proper divisors (190346907).

428913381 is a wasteful number, since it uses less digits than its factorization.

428913381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 846012 (or 845999 counting only the distinct ones).

The product of its digits is 41472, while the sum is 39.

The square root of 428913381 is about 20710.2240692852. The cubic root of 428913381 is about 754.1479099446.

The spelling of 428913381 in words is "four hundred twenty-eight million, nine hundred thirteen thousand, three hundred eighty-one".