40721380 has 48 divisors (see below), whose sum is σ = 98332416. Its totient is φ = 13875840.

The previous prime is 40721363. The next prime is 40721381. The reversal of 40721380 is 8312704.

It is not an unprimeable number, because it can be changed into a prime (40721381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24537 + ... + 26143.

It is an arithmetic number, because the mean of its divisors is an integer number (2048592).

Almost surely, 2^40721380 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 40721380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49166208).

40721380 is an abundant number, since it is smaller than the sum of its proper divisors (57611036).

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

40721380 is a wasteful number, since it uses less digits than its factorization.

40721380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1804 (or 1802 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 40721380 is about 6381.3305822532. The cubic root of 40721380 is about 344.0388567068.

The spelling of 40721380 in words is "forty million, seven hundred twenty-one thousand, three hundred eighty".