40409697 has 16 divisors (see below), whose sum is σ = 57177792. Its totient is φ = 25297920.

The previous prime is 40409693. The next prime is 40409711. The reversal of 40409697 is 79690404.

It is not a de Polignac number, because 40409697 - 2² = 40409693 is a prime.

It is a super-2 number, since 2×40409697² = 3265887223263618, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40409693) 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 15 ways as a sum of consecutive naturals, for example, 40873 + ... + 41849.

It is an arithmetic number, because the mean of its divisors is an integer number (3573612).

Almost surely, 2^40409697 is an apocalyptic number.

It is an amenable number.

40409697 is a deficient number, since it is larger than the sum of its proper divisors (16768095).

40409697 is a wasteful number, since it uses less digits than its factorization.

40409697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1808.

The product of its (nonzero) digits is 54432, while the sum is 39.

The square root of 40409697 is about 6356.8621976570. The cubic root of 40409697 is about 343.1588454708.

The spelling of 40409697 in words is "forty million, four hundred nine thousand, six hundred ninety-seven".