1428557238 has 12 divisors (see below), whose sum is σ = 3095207388. Its totient is φ = 476185740.

The previous prime is 1428557201. The next prime is 1428557281. The reversal of 1428557238 is 8327558241.

1428557238 is a `hidden beast` number, since 1 + 42 + 8 + 5 + 572 + 38 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 1428557193 and 1428557202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 39682128 + ... + 39682163.

It is an arithmetic number, because the mean of its divisors is an integer number (257933949).

Almost surely, 2^1428557238 is an apocalyptic number.

1428557238 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1428557238 is an abundant number, since it is smaller than the sum of its proper divisors (1666650150).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1428557238 is a wasteful number, since it uses less digits than its factorization.

1428557238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79364299 (or 79364296 counting only the distinct ones).

The product of its digits is 537600, while the sum is 45.

The square root of 1428557238 is about 37796.2595768417. The cubic root of 1428557238 is about 1126.2441512744.

The spelling of 1428557238 in words is "one billion, four hundred twenty-eight million, five hundred fifty-seven thousand, two hundred thirty-eight".