1948721749 has 8 divisors (see below), whose sum is σ = 2099095992. Its totient is φ = 1798415040.

The previous prime is 1948721711. The next prime is 1948721767. The reversal of 1948721749 is 9471278491.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 218744100 + 1729977649 = 14790^2 + 41593^2 .

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 1948721749 - 2¹¹ = 1948719701 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1948721696 and 1948721705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1948721779) 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, 54147 + ... + 82639.

It is an arithmetic number, because the mean of its divisors is an integer number (262386999).

Almost surely, 2^1948721749 is an apocalyptic number.

It is an amenable number.

1948721749 is a deficient number, since it is larger than the sum of its proper divisors (150374243).

1948721749 is a wasteful number, since it uses less digits than its factorization.

1948721749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33767.

The product of its digits is 1016064, while the sum is 52.

The square root of 1948721749 is about 44144.3286164825. The cubic root of 1948721749 is about 1249.0599329831.

The spelling of 1948721749 in words is "one billion, nine hundred forty-eight million, seven hundred twenty-one thousand, seven hundred forty-nine".