1898228981 has 8 divisors (see below), whose sum is σ = 2071159200. Its totient is φ = 1725359440.

The previous prime is 1898228963. The next prime is 1898228989.

1898228981 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1898228981 is a prime.

It is a super-2 number, since 2×1898228981² = 7206546528616596722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1898228989) 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, 72110 + ... + 94848.

It is an arithmetic number, because the mean of its divisors is an integer number (258894900).

Almost surely, 2^1898228981 is an apocalyptic number.

1898228981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1898228981 is a deficient number, since it is larger than the sum of its proper divisors (172930219).

1898228981 is a wasteful number, since it uses less digits than its factorization.

1898228981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30339.

The product of its digits is 1327104, while the sum is 56.

The square root of 1898228981 is about 43568.6697180440. The cubic root of 1898228981 is about 1238.1773823830.

The spelling of 1898228981 in words is "one billion, eight hundred ninety-eight million, two hundred twenty-eight thousand, nine hundred eighty-one".