40121208 has 48 divisors (see below), whose sum is σ = 110296680. Its totient is φ = 13172544.

The previous prime is 40121203. The next prime is 40121219. The reversal of 40121208 is 80212104.

It is a super-2 number, since 2×40121208² = 3219422662758528, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40121203) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 666 + ... + 8982.

Almost surely, 2^40121208 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 40121208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55148340).

40121208 is an abundant number, since it is smaller than the sum of its proper divisors (70175472).

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

40121208 is a wasteful number, since it uses less digits than its factorization.

40121208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8396 (or 8389 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 40121208 is about 6334.1304059831. The cubic root of 40121208 is about 342.3402789471.

It can be divided in two parts, 401 and 21208, that added together give a square (21609 = 147²).

The spelling of 40121208 in words is "forty million, one hundred twenty-one thousand, two hundred eight".