40381672 has 8 divisors (see below), whose sum is σ = 75715650. Its totient is φ = 20190832.

The previous prime is 40381661. The next prime is 40381673. The reversal of 40381672 is 27618304.

It can be written as a sum of positive squares in only one way, i.e., 28451556 + 11930116 = 5334^2 + 3454^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (40381673) 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 as a sum of consecutive naturals, namely, 2523847 + ... + 2523862.

Almost surely, 2^40381672 is an apocalyptic number.

It is an amenable number.

40381672 is a deficient number, since it is larger than the sum of its proper divisors (35333978).

40381672 is a wasteful number, since it uses less digits than its factorization.

40381672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5047715 (or 5047711 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 40381672 is about 6354.6575045395. The cubic root of 40381672 is about 343.0794977612.

Adding to 40381672 its reverse (27618304), we get a palindrome (67999976).

The spelling of 40381672 in words is "forty million, three hundred eighty-one thousand, six hundred seventy-two".