1142978399 has 16 divisors (see below), whose sum is σ = 1235942400. Its totient is φ = 1054269216.

The previous prime is 1142978381. The next prime is 1142978407. The reversal of 1142978399 is 9938792411.

It is not a de Polignac number, because 1142978399 - 2²⁰ = 1141929823 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1142978399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1142978999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70817 + ... + 85445.

It is an arithmetic number, because the mean of its divisors is an integer number (77246400).

Almost surely, 2^1142978399 is an apocalyptic number.

1142978399 is a deficient number, since it is larger than the sum of its proper divisors (92964001).

1142978399 is a wasteful number, since it uses less digits than its factorization.

1142978399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14774.

The product of its digits is 979776, while the sum is 53.

The square root of 1142978399 is about 33807.9635441119. The cubic root of 1142978399 is about 1045.5528919498.

The spelling of 1142978399 in words is "one billion, one hundred forty-two million, nine hundred seventy-eight thousand, three hundred ninety-nine".