40690961 has 8 divisors (see below), whose sum is σ = 41224680. Its totient is φ = 40160512.

The previous prime is 40690919. The next prime is 40690963. The reversal of 40690961 is 16909604.

It can be written as a sum of positive squares in 4 ways, for example, as 16000000 + 24690961 = 4000^2 + 4969^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 40690961 - 2¹⁰ = 40689937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40690963) 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, 32495 + ... + 33723.

It is an arithmetic number, because the mean of its divisors is an integer number (5153085).

Almost surely, 2^40690961 is an apocalyptic number.

It is an amenable number.

40690961 is a deficient number, since it is larger than the sum of its proper divisors (533719).

40690961 is a wasteful number, since it uses less digits than its factorization.

40690961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1635.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 40690961 is about 6378.9466998871. The cubic root of 40690961 is about 343.9531693280.

The spelling of 40690961 in words is "forty million, six hundred ninety thousand, nine hundred sixty-one".