1981340755 has 8 divisors (see below), whose sum is σ = 2459595600. Its totient is φ = 1530414816.

The previous prime is 1981340741. The next prime is 1981340759. The reversal of 1981340755 is 5570431891.

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 1981340755 - 2⁹ = 1981340243 is a prime.

It is a super-3 number, since 3×1981340755³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (1981340759) 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, 6832065 + ... + 6832354.

It is an arithmetic number, because the mean of its divisors is an integer number (307449450).

Almost surely, 2^1981340755 is an apocalyptic number.

1981340755 is a deficient number, since it is larger than the sum of its proper divisors (478254845).

1981340755 is a wasteful number, since it uses less digits than its factorization.

1981340755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13664453.

The product of its (nonzero) digits is 151200, while the sum is 43.

The square root of 1981340755 is about 44512.2539869641. The cubic root of 1981340755 is about 1255.9906053211.

The spelling of 1981340755 in words is "one billion, nine hundred eighty-one million, three hundred forty thousand, seven hundred fifty-five".