40978340 has 36 divisors (see below), whose sum is σ = 92908116. Its totient is φ = 15092352.

The previous prime is 40978309. The next prime is 40978361. The reversal of 40978340 is 4387904.

It can be written as a sum of positive squares in 6 ways, for example, as 350464 + 40627876 = 592^2 + 6374^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 40978340.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 103022 + ... + 103418.

It is an arithmetic number, because the mean of its divisors is an integer number (2580781).

Almost surely, 2^40978340 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 40978340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46454058).

40978340 is an abundant number, since it is smaller than the sum of its proper divisors (51929776).

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

40978340 is a wasteful number, since it uses less digits than its factorization.

40978340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 816 (or 417 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 40978340 is about 6401.4326521490. The cubic root of 40978340 is about 344.7609910775.

The spelling of 40978340 in words is "forty million, nine hundred seventy-eight thousand, three hundred forty".