1896886981 has 16 divisors (see below), whose sum is σ = 2166756480. Its totient is φ = 1643773120.

The previous prime is 1896886967. The next prime is 1896886987.

1896886981 is nontrivially palindromic in base 10.

It is a de Polignac number, because none of the positive numbers 2^k-1896886981 is a prime.

It is a super-2 number, since 2×1896886981² = 7196360437374588722, 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 (1896886987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61335 + ... + 86923.

It is an arithmetic number, because the mean of its divisors is an integer number (135422280).

Almost surely, 2^1896886981 is an apocalyptic number.

1896886981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1896886981 is a deficient number, since it is larger than the sum of its proper divisors (269869499).

1896886981 is a wasteful number, since it uses less digits than its factorization.

1896886981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25916.

The product of its digits is 11943936, while the sum is 64.

The square root of 1896886981 is about 43553.2660198980. The cubic root of 1896886981 is about 1237.8855268701.

The spelling of 1896886981 in words is "one billion, eight hundred ninety-six million, eight hundred eighty-six thousand, nine hundred eighty-one".