19121140 has 12 divisors (see below), whose sum is σ = 40154436. Its totient is φ = 7648448.

The previous prime is 19121131. The next prime is 19121143. The reversal of 19121140 is 4112191.

It can be written as a sum of positive squares in 2 ways, for example, as 14333796 + 4787344 = 3786^2 + 2188^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19121143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 478009 + ... + 478048.

It is an arithmetic number, because the mean of its divisors is an integer number (3346203).

Almost surely, 2^19121140 is an apocalyptic number.

19121140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19121140 is an abundant number, since it is smaller than the sum of its proper divisors (21033296).

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

19121140 is a wasteful number, since it uses less digits than its factorization.

19121140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 956066 (or 956064 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 19121140 is about 4372.7725758379. The cubic root of 19121140 is about 267.4060694461.

The spelling of 19121140 in words is "nineteen million, one hundred twenty-one thousand, one hundred forty".