1981404676 has 6 divisors (see below), whose sum is σ = 3467458190. Its totient is φ = 990702336.

The previous prime is 1981404673. The next prime is 1981404679. The reversal of 1981404676 is 6764041891.

It is an interprime number because it is at equal distance from previous prime (1981404673) and next prime (1981404679).

It can be written as a sum of positive squares in only one way, i.e., 1945692100 + 35712576 = 44110^2 + 5976^2 .

It is a super-3 number, since 3×1981404676³ (a number of 29 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1981404673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247675581 + ... + 247675588.

Almost surely, 2^1981404676 is an apocalyptic number.

It is an amenable number.

1981404676 is a deficient number, since it is larger than the sum of its proper divisors (1486053514).

1981404676 is a wasteful number, since it uses less digits than its factorization.

1981404676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495351173 (or 495351171 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 46.

The square root of 1981404676 is about 44512.9719969359. The cubic root of 1981404676 is about 1256.0041118842.

The spelling of 1981404676 in words is "one billion, nine hundred eighty-one million, four hundred four thousand, six hundred seventy-six".