40439930 has 16 divisors (see below), whose sum is σ = 72959400. Its totient is φ = 16138752.

The previous prime is 40439879. The next prime is 40439939. The reversal of 40439930 is 3993404.

It can be written as a sum of positive squares in 4 ways, for example, as 26429881 + 14010049 = 5141^2 + 3743^2 .

It is not an unprimeable number, because it can be changed into a prime (40439939) 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 7 ways as a sum of consecutive naturals, for example, 146 + ... + 8994.

Almost surely, 2^40439930 is an apocalyptic number.

40439930 is a deficient number, since it is larger than the sum of its proper divisors (32519470).

40439930 is a wasteful number, since it uses less digits than its factorization.

40439930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9313.

The product of its (nonzero) digits is 11664, while the sum is 32.

The square root of 40439930 is about 6359.2397344337. The cubic root of 40439930 is about 343.2444036074.

The spelling of 40439930 in words is "forty million, four hundred thirty-nine thousand, nine hundred thirty".