1428085989 has 12 divisors (see below), whose sum is σ = 2250317472. Its totient is φ = 865506600.

The previous prime is 1428085957. The next prime is 1428086041. The reversal of 1428085989 is 9895808241.

1428085989 is a `hidden beast` number, since 1 + 42 + 8 + 0 + 8 + 598 + 9 = 666.

It is not a de Polignac number, because 1428085989 - 2⁵ = 1428085957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1428085909) 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, 7212457 + ... + 7212654.

It is an arithmetic number, because the mean of its divisors is an integer number (187526456).

Almost surely, 2^1428085989 is an apocalyptic number.

It is an amenable number.

1428085989 is a deficient number, since it is larger than the sum of its proper divisors (822231483).

1428085989 is a wasteful number, since it uses less digits than its factorization.

1428085989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14425128 (or 14425125 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 54.

The square root of 1428085989 is about 37790.0249933762. The cubic root of 1428085989 is about 1126.1202967572.

The spelling of 1428085989 in words is "one billion, four hundred twenty-eight million, eighty-five thousand, nine hundred eighty-nine".