40005380 has 12 divisors (see below), whose sum is σ = 84011340. Its totient is φ = 16002144.

The previous prime is 40005379. The next prime is 40005397. The reversal of 40005380 is 8350004.

It can be written as a sum of positive squares in 2 ways, for example, as 28047616 + 11957764 = 5296^2 + 3458^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 2000269 = 40005380 / (4 + 0 + 0 + 0 + 5 + 3 + 8 + 0).

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1000115 + ... + 1000154.

It is an arithmetic number, because the mean of its divisors is an integer number (7000945).

Almost surely, 2^40005380 is an apocalyptic number.

It is an amenable number.

40005380 is an abundant number, since it is smaller than the sum of its proper divisors (44005960).

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

40005380 is a wasteful number, since it uses less digits than its factorization.

40005380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2000278 (or 2000276 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 40005380 is about 6324.9806323814. The cubic root of 40005380 is about 342.0105214323.

Adding to 40005380 its reverse (8350004), we get a palindrome (48355384).

The spelling of 40005380 in words is "forty million, five thousand, three hundred eighty".