1890880981 has 8 divisors (see below), whose sum is σ = 2184119424. Its totient is φ = 1617865920.

The previous prime is 1890880973. The next prime is 1890880993.

1890880981 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1890880981 - 2³ = 1890880973 is a prime.

It is a super-2 number, since 2×1890880981² = 7150861768615044722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1890880951) 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, 5055645 + ... + 5056018.

It is an arithmetic number, because the mean of its divisors is an integer number (273014928).

Almost surely, 2^1890880981 is an apocalyptic number.

1890880981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1890880981 is a deficient number, since it is larger than the sum of its proper divisors (293238443).

1890880981 is a wasteful number, since it uses less digits than its factorization.

1890880981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10111691.

The product of its (nonzero) digits is 331776, while the sum is 52.

The square root of 1890880981 is about 43484.2613022229. The cubic root of 1890880981 is about 1236.5776645487.

The spelling of 1890880981 in words is "one billion, eight hundred ninety million, eight hundred eighty thousand, nine hundred eighty-one".