40406740 has 72 divisors (see below), whose sum is σ = 95185440. Its totient is φ = 14393280.

The previous prime is 40406687. The next prime is 40406747. The reversal of 40406740 is 4760404.

40406740 = T₄₁₆ + T₄₁₇ + ... + T₆₇₉.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40406747) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 142639 + ... + 142921.

It is an arithmetic number, because the mean of its divisors is an integer number (1322020).

Almost surely, 2^40406740 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 40406740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47592720).

40406740 is an abundant number, since it is smaller than the sum of its proper divisors (54778700).

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

40406740 is a wasteful number, since it uses less digits than its factorization.

40406740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373 (or 360 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 40406740 is about 6356.6296101000. The cubic root of 40406740 is about 343.1504749926.

The spelling of 40406740 in words is "forty million, four hundred six thousand, seven hundred forty".