40397280 has 192 divisors, whose sum is σ = 158796288. Its totient is φ = 8386560.

The previous prime is 40397263. The next prime is 40397281. The reversal of 40397280 is 8279304.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40397281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36414 + ... + 37506.

It is an arithmetic number, because the mean of its divisors is an integer number (827064).

Almost surely, 2^40397280 is an apocalyptic number.

40397280 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40397280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79398144).

40397280 is an abundant number, since it is smaller than the sum of its proper divisors (118399008).

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

40397280 is a wasteful number, since it uses less digits than its factorization.

40397280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1129 (or 1121 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 40397280 is about 6355.8854615230. The cubic root of 40397280 is about 343.1236935130.

The spelling of 40397280 in words is "forty million, three hundred ninety-seven thousand, two hundred eighty".