40040001820 has 48 divisors (see below), whose sum is σ = 103488009408. Its totient is φ = 12672000000.

The previous prime is 40040001817. The next prime is 40040001821. The reversal of 40040001820 is 2810004004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40040001821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10998181 + ... + 11001820.

It is an arithmetic number, because the mean of its divisors is an integer number (2156000196).

Almost surely, 2^40040001820 is an apocalyptic number.

It is an amenable number.

40040001820 is an abundant number, since it is smaller than the sum of its proper divisors (63448007588).

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

40040001820 is a wasteful number, since it uses less digits than its factorization.

40040001820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22000030 (or 22000028 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 40040001820 its reverse (2810004004), we get a palindrome (42850005824).

The spelling of 40040001820 in words is "forty billion, forty million, one thousand, eight hundred twenty".