40721340 has 144 divisors (see below), whose sum is σ = 128701440. Its totient is φ = 9609600.

The previous prime is 40721333. The next prime is 40721347. The reversal of 40721340 is 4312704.

It is an interprime number because it is at equal distance from previous prime (40721333) and next prime (40721347).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40721347) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 515421 + ... + 515499.

It is an arithmetic number, because the mean of its divisors is an integer number (893760).

Almost surely, 2^40721340 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 40721340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64350720).

40721340 is an abundant number, since it is smaller than the sum of its proper divisors (87980100).

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

40721340 is a wasteful number, since it uses less digits than its factorization.

40721340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184 (or 171 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 40721340 is about 6381.3274481098. The cubic root of 40721340 is about 344.0387440587.

It can be divided in two parts, 407213 and 40, that added together give a triangular number (407253 = T₉₀₂).

The spelling of 40721340 in words is "forty million, seven hundred twenty-one thousand, three hundred forty".