19121616 has 40 divisors (see below), whose sum is σ = 54887360. Its totient is φ = 6373728.

The previous prime is 19121593. The next prime is 19121629. The reversal of 19121616 is 61612191.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 19121616.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 21700 + ... + 22563.

It is an arithmetic number, because the mean of its divisors is an integer number (1372184).

Almost surely, 2^19121616 is an apocalyptic number.

19121616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

19121616 is an abundant number, since it is smaller than the sum of its proper divisors (35765744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19121616 is a wasteful number, since it uses less digits than its factorization.

19121616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44280 (or 44268 counting only the distinct ones).

The product of its digits is 648, while the sum is 27.

The square root of 19121616 is about 4372.8270032097. The cubic root of 19121616 is about 267.4082883555.

The spelling of 19121616 in words is "nineteen million, one hundred twenty-one thousand, six hundred sixteen".