1142723731 has 4 divisors (see below), whose sum is σ = 1209942792. Its totient is φ = 1075504672.

The previous prime is 1142723717. The next prime is 1142723749. The reversal of 1142723731 is 1373272411.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1142723731 is a prime.

It is a super-2 number, since 2×1142723731² = 2611635050781120722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1142723693 and 1142723702.

It is not an unprimeable number, because it can be changed into a prime (1142727731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33609505 + ... + 33609538.

It is an arithmetic number, because the mean of its divisors is an integer number (302485698).

Almost surely, 2^1142723731 is an apocalyptic number.

1142723731 is a deficient number, since it is larger than the sum of its proper divisors (67219061).

1142723731 is an equidigital number, since it uses as much as digits as its factorization.

1142723731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67219060.

The product of its digits is 7056, while the sum is 31.

The square root of 1142723731 is about 33804.1969435749. The cubic root of 1142723731 is about 1045.4752326687.

The spelling of 1142723731 in words is "one billion, one hundred forty-two million, seven hundred twenty-three thousand, seven hundred thirty-one".