1391749653 has 16 divisors (see below), whose sum is σ = 2170082816. Its totient is φ = 776790000.

The previous prime is 1391749627. The next prime is 1391749669. The reversal of 1391749653 is 3569471931.

It is not a de Polignac number, because 1391749653 - 2¹⁰ = 1391748629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391749673) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 769723 + ... + 771528.

It is an arithmetic number, because the mean of its divisors is an integer number (135630176).

Almost surely, 2^1391749653 is an apocalyptic number.

It is an amenable number.

1391749653 is a deficient number, since it is larger than the sum of its proper divisors (778333163).

1391749653 is a wasteful number, since it uses less digits than its factorization.

1391749653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1541304.

The product of its digits is 612360, while the sum is 48.

The square root of 1391749653 is about 37306.1610595355. The cubic root of 1391749653 is about 1116.4870940271.

The spelling of 1391749653 in words is "one billion, three hundred ninety-one million, seven hundred forty-nine thousand, six hundred fifty-three".