1248391749 has 8 divisors (see below), whose sum is σ = 1815842592. Its totient is φ = 756601040.

The previous prime is 1248391747. The next prime is 1248391777. The reversal of 1248391749 is 9471938421.

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 1248391749 - 2¹ = 1248391747 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1248391698 and 1248391707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1248391741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18914994 + ... + 18915059.

It is an arithmetic number, because the mean of its divisors is an integer number (226980324).

Almost surely, 2^1248391749 is an apocalyptic number.

It is an amenable number.

1248391749 is a deficient number, since it is larger than the sum of its proper divisors (567450843).

1248391749 is a wasteful number, since it uses less digits than its factorization.

1248391749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37830067.

The product of its digits is 435456, while the sum is 48.

The square root of 1248391749 is about 35332.5876352129. The cubic root of 1248391749 is about 1076.7551638457.

The spelling of 1248391749 in words is "one billion, two hundred forty-eight million, three hundred ninety-one thousand, seven hundred forty-nine".