1383756731421 has 48 divisors (see below), whose sum is σ = 1913546980800. Its totient is φ = 888893399040.

The previous prime is 1383756731389. The next prime is 1383756731437. The reversal of 1383756731421 is 1241376573831.

It is not a de Polignac number, because 1383756731421 - 2⁵ = 1383756731389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1383756731321) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 682661410 + ... + 682663436.

It is an arithmetic number, because the mean of its divisors is an integer number (39865562100).

Almost surely, 2^{1383756731421} is an apocalyptic number.

It is an amenable number.

1383756731421 is a deficient number, since it is larger than the sum of its proper divisors (529790249379).

1383756731421 is a wasteful number, since it uses less digits than its factorization.

1383756731421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2606 (or 2413 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 51.

The spelling of 1383756731421 in words is "one trillion, three hundred eighty-three billion, seven hundred fifty-six million, seven hundred thirty-one thousand, four hundred twenty-one".