1142778897 has 24 divisors (see below), whose sum is σ = 1854949824. Its totient is φ = 672670944.

The previous prime is 1142778853. The next prime is 1142778911. The reversal of 1142778897 is 7988772411.

It is not a de Polignac number, because 1142778897 - 2¹⁹ = 1142254609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1142778827) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 209643 + ... + 215024.

It is an arithmetic number, because the mean of its divisors is an integer number (77289576).

Almost surely, 2^1142778897 is an apocalyptic number.

It is an amenable number.

1142778897 is a deficient number, since it is larger than the sum of its proper divisors (712170927).

1142778897 is a wasteful number, since it uses less digits than its factorization.

1142778897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424709 (or 424706 counting only the distinct ones).

The product of its digits is 1580544, while the sum is 54.

The square root of 1142778897 is about 33805.0128974979. The cubic root of 1142778897 is about 1045.4920561455.

The spelling of 1142778897 in words is "one billion, one hundred forty-two million, seven hundred seventy-eight thousand, eight hundred ninety-seven".