40409972 has 6 divisors (see below), whose sum is σ = 70717458. Its totient is φ = 20204984.

The previous prime is 40409959. The next prime is 40409983. The reversal of 40409972 is 27990404.

40409972 is nontrivially palindromic in base 3.

40409972 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 40398736 + 11236 = 6356^2 + 106^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5051243 + ... + 5051250.

It is an arithmetic number, because the mean of its divisors is an integer number (11786243).

Almost surely, 2^40409972 is an apocalyptic number.

It is an amenable number.

40409972 is a deficient number, since it is larger than the sum of its proper divisors (30307486).

40409972 is a wasteful number, since it uses less digits than its factorization.

40409972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10102497 (or 10102495 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 40409972 is about 6356.8838277886. The cubic root of 40409972 is about 343.1596239017.

The spelling of 40409972 in words is "forty million, four hundred nine thousand, nine hundred seventy-two".