19990311 has 16 divisors (see below), whose sum is σ = 29164800. Its totient is φ = 12078720.

The previous prime is 19990307. The next prime is 19990349. The reversal of 19990311 is 11309991.

It is not a de Polignac number, because 19990311 - 2² = 19990307 is a prime.

It is a super-2 number, since 2×19990311² = 799225067753442, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19990391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13590 + ... + 14988.

It is an arithmetic number, because the mean of its divisors is an integer number (1822800).

Almost surely, 2^19990311 is an apocalyptic number.

19990311 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

19990311 is a deficient number, since it is larger than the sum of its proper divisors (9174489).

19990311 is a wasteful number, since it uses less digits than its factorization.

19990311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1846.

The product of its (nonzero) digits is 2187, while the sum is 33.

The square root of 19990311 is about 4471.0525606394. The cubic root of 19990311 is about 271.3979212588.

It can be divided in two parts, 19990 and 311, that added together give a triangular number (20301 = T₂₀₁).

The spelling of 19990311 in words is "nineteen million, nine hundred ninety thousand, three hundred eleven".