1023739649 has 8 divisors (see below), whose sum is σ = 1035132840. Its totient is φ = 1012363776.

The previous prime is 1023739579. The next prime is 1023739669. The reversal of 1023739649 is 9469373201.

It can be written as a sum of positive squares in 4 ways, for example, as 236544400 + 787195249 = 15380^2 + 28057^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1023739649 - 2¹² = 1023735553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1023739669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 141287 + ... + 148355.

It is an arithmetic number, because the mean of its divisors is an integer number (129391605).

Almost surely, 2^1023739649 is an apocalyptic number.

It is an amenable number.

1023739649 is a deficient number, since it is larger than the sum of its proper divisors (11393191).

1023739649 is an equidigital number, since it uses as much as digits as its factorization.

1023739649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8659.

The product of its (nonzero) digits is 244944, while the sum is 44.

The square root of 1023739649 is about 31995.9317570219. The cubic root of 1023739649 is about 1007.8514103563.

The spelling of 1023739649 in words is "one billion, twenty-three million, seven hundred thirty-nine thousand, six hundred forty-nine".