1981385294 has 16 divisors (see below), whose sum is σ = 3417502848. Its totient is φ = 843954552.

The previous prime is 1981385291. The next prime is 1981385327. The reversal of 1981385294 is 4925831891.

It is a super-3 number, since 3×1981385294³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981385291) 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, 431852 + ... + 436415.

It is an arithmetic number, because the mean of its divisors is an integer number (213593928).

Almost surely, 2^1981385294 is an apocalyptic number.

1981385294 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1981385294 is a deficient number, since it is larger than the sum of its proper divisors (1436117554).

1981385294 is a wasteful number, since it uses less digits than its factorization.

1981385294 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868439.

The product of its digits is 622080, while the sum is 50.

The square root of 1981385294 is about 44512.7542845868. The cubic root of 1981385294 is about 1256.0000164814. Note that the first 4 decimals are identical.

The spelling of 1981385294 in words is "one billion, nine hundred eighty-one million, three hundred eighty-five thousand, two hundred ninety-four".