40002012 has 60 divisors (see below), whose sum is σ = 105170296. Its totient is φ = 13258080.

The previous prime is 40001999. The next prime is 40002023. The reversal of 40002012 is 21020004.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 40001985 and 40002003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 107058 + ... + 107430.

Almost surely, 2^40002012 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40002012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52585148).

40002012 is an abundant number, since it is smaller than the sum of its proper divisors (65168284).

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

40002012 is a wasteful number, since it uses less digits than its factorization.

40002012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720 (or 709 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 40002012 is about 6324.7143809029. The cubic root of 40002012 is about 342.0009233585. Note that the first 3 decimals are identical.

Adding to 40002012 its reverse (21020004), we get a palindrome (61022016).

The spelling of 40002012 in words is "forty million, two thousand, twelve".