40144121819 has 4 divisors (see below), whose sum is σ = 40437144744. Its totient is φ = 39851098896.

The previous prime is 40144121807. The next prime is 40144121837. The reversal of 40144121819 is 91812144104.

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

It is a cyclic number.

It is not a de Polignac number, because 40144121819 - 2⁴ = 40144121803 is a prime.

It is a super-2 number, since 2×40144121819² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40144126819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146511257 + ... + 146511530.

It is an arithmetic number, because the mean of its divisors is an integer number (10109286186).

Almost surely, 2^40144121819 is an apocalyptic number.

40144121819 is a deficient number, since it is larger than the sum of its proper divisors (293022925).

40144121819 is a wasteful number, since it uses less digits than its factorization.

40144121819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293022924.

The product of its (nonzero) digits is 9216, while the sum is 35.

The spelling of 40144121819 in words is "forty billion, one hundred forty-four million, one hundred twenty-one thousand, eight hundred nineteen".