1142723781 has 24 divisors (see below), whose sum is σ = 1713397504. Its totient is φ = 761076000.

The previous prime is 1142723773. The next prime is 1142723807. The reversal of 1142723781 is 1873272411.

1142723781 is a `hidden beast` number, since 1 + 14 + 272 + 378 + 1 = 666.

It is not a de Polignac number, because 1142723781 - 2³ = 1142723773 is a prime.

It is a super-2 number, since 2×1142723781² = 2611635279325871922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1142723081) 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, 379281 + ... + 382281.

Almost surely, 2^1142723781 is an apocalyptic number.

It is an amenable number.

1142723781 is a deficient number, since it is larger than the sum of its proper divisors (570673723).

1142723781 is an equidigital number, since it uses as much as digits as its factorization.

1142723781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4583 (or 4571 counting only the distinct ones).

The product of its digits is 18816, while the sum is 36.

The square root of 1142723781 is about 33804.1976831281. The cubic root of 1142723781 is about 1045.4752479170.

The spelling of 1142723781 in words is "one billion, one hundred forty-two million, seven hundred twenty-three thousand, seven hundred eighty-one".