2040021438 has 64 divisors (see below), whose sum is σ = 5028764160. Its totient is φ = 537259392.

The previous prime is 2040021413. The next prime is 2040021439. The reversal of 2040021438 is 8341200402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2040021439) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 450381 + ... + 454887.

It is an arithmetic number, because the mean of its divisors is an integer number (78574440).

Almost surely, 2^2040021438 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2040021438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2514382080).

2040021438 is an abundant number, since it is smaller than the sum of its proper divisors (2988742722).

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

2040021438 is a wasteful number, since it uses less digits than its factorization.

2040021438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5361.

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 2040021438 is about 45166.5964845703. The cubic root of 2040021438 is about 1268.2695837196.

The spelling of 2040021438 in words is "two billion, forty million, twenty-one thousand, four hundred thirty-eight".