1899549818 has 4 divisors (see below), whose sum is σ = 2849324730. Its totient is φ = 949774908.

The previous prime is 1899549809. The next prime is 1899549877. The reversal of 1899549818 is 8189459981.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1675837969 + 223711849 = 40937^2 + 14957^2 .

It is a super-2 number, since 2×1899549818² = 7216579022127666248, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 474887453 + ... + 474887456.

Almost surely, 2^1899549818 is an apocalyptic number.

1899549818 is a deficient number, since it is larger than the sum of its proper divisors (949774912).

1899549818 is an equidigital number, since it uses as much as digits as its factorization.

1899549818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 949774911.

The product of its digits is 7464960, while the sum is 62.

The square root of 1899549818 is about 43583.8251877919. The cubic root of 1899549818 is about 1238.4645011197.

The spelling of 1899549818 in words is "one billion, eight hundred ninety-nine million, five hundred forty-nine thousand, eight hundred eighteen".