40991965 has 8 divisors (see below), whose sum is σ = 56217600. Its totient is φ = 28108752.

The previous prime is 40991963. The next prime is 40991983. The reversal of 40991965 is 56919904.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40991965 - 2¹ = 40991963 is a prime.

It is a super-2 number, since 2×40991965² = 3360682389122450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40991963) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 585565 + ... + 585634.

It is an arithmetic number, because the mean of its divisors is an integer number (7027200).

Almost surely, 2^40991965 is an apocalyptic number.

It is an amenable number.

40991965 is a deficient number, since it is larger than the sum of its proper divisors (15225635).

40991965 is a wasteful number, since it uses less digits than its factorization.

40991965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1171211.

The product of its (nonzero) digits is 87480, while the sum is 43.

The square root of 40991965 is about 6402.4967786013. The cubic root of 40991965 is about 344.7991970174.

The spelling of 40991965 in words is "forty million, nine hundred ninety-one thousand, nine hundred sixty-five".