40029661 has 4 divisors (see below), whose sum is σ = 45748192. Its totient is φ = 34311132.

The previous prime is 40029659. The next prime is 40029667. The reversal of 40029661 is 16692004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40029661 - 2¹ = 40029659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40029667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2859255 + ... + 2859268.

It is an arithmetic number, because the mean of its divisors is an integer number (11437048).

Almost surely, 2^40029661 is an apocalyptic number.

It is an amenable number.

40029661 is a deficient number, since it is larger than the sum of its proper divisors (5718531).

40029661 is an equidigital number, since it uses as much as digits as its factorization.

40029661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5718530.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 40029661 is about 6326.8997937378. The cubic root of 40029661 is about 342.0797011105.

The spelling of 40029661 in words is "forty million, twenty-nine thousand, six hundred sixty-one".