1899229981 has 8 divisors (see below), whose sum is σ = 2143332000. Its totient is φ = 1667035440.

The previous prime is 1899229979. The next prime is 1899229993.

1899229981 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 not a de Polignac number, because 1899229981 - 2¹ = 1899229979 is a prime.

It is a super-2 number, since 2×1899229981² = 7214149041458520722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1899229901) 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, 2976531 + ... + 2977168.

It is an arithmetic number, because the mean of its divisors is an integer number (267916500).

Almost surely, 2^1899229981 is an apocalyptic number.

1899229981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1899229981 is a deficient number, since it is larger than the sum of its proper divisors (244102019).

1899229981 is a wasteful number, since it uses less digits than its factorization.

1899229981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5953739.

The product of its digits is 1679616, while the sum is 58.

The square root of 1899229981 is about 43580.1558166099. The cubic root of 1899229981 is about 1238.3949883330.

The spelling of 1899229981 in words is "one billion, eight hundred ninety-nine million, two hundred twenty-nine thousand, nine hundred eighty-one".