1142399978 has 4 divisors (see below), whose sum is σ = 1713599970. Its totient is φ = 571199988.

The previous prime is 1142399971. The next prime is 1142400031. The reversal of 1142399978 is 8799932411.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1138185169 + 4214809 = 33737^2 + 2053^2 .

It is not an unprimeable number, because it can be changed into a prime (1142399971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 285599993 + ... + 285599996.

Almost surely, 2^1142399978 is an apocalyptic number.

1142399978 is a deficient number, since it is larger than the sum of its proper divisors (571199992).

1142399978 is an equidigital number, since it uses as much as digits as its factorization.

1142399978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571199991.

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

The square root of 1142399978 is about 33799.4079533947. The cubic root of 1142399978 is about 1045.3764897255.

The spelling of 1142399978 in words is "one billion, one hundred forty-two million, three hundred ninety-nine thousand, nine hundred seventy-eight".