1142889391 has 32 divisors (see below), whose sum is σ = 1391644800. Its totient is φ = 917790720.

The previous prime is 1142889353. The next prime is 1142889409. The reversal of 1142889391 is 1939882411.

It is a de Polignac number, because none of the positive numbers 2^k-1142889391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1142889301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2937825 + ... + 2938213.

It is an arithmetic number, because the mean of its divisors is an integer number (43488900).

Almost surely, 2^1142889391 is an apocalyptic number.

1142889391 is a deficient number, since it is larger than the sum of its proper divisors (248755409).

1142889391 is a wasteful number, since it uses less digits than its factorization.

1142889391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 819.

The product of its digits is 124416, while the sum is 46.

The square root of 1142889391 is about 33806.6471422411. The cubic root of 1142889391 is about 1045.5257508747.

The spelling of 1142889391 in words is "one billion, one hundred forty-two million, eight hundred eighty-nine thousand, three hundred ninety-one".