40320061 has 4 divisors (see below), whose sum is σ = 40696992. Its totient is φ = 39943132.

The previous prime is 40320053. The next prime is 40320067. The reversal of 40320061 is 16002304.

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 40320061 - 2³ = 40320053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40320067) 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, 188305 + ... + 188518.

It is an arithmetic number, because the mean of its divisors is an integer number (10174248).

Almost surely, 2^40320061 is an apocalyptic number.

It is an amenable number.

40320061 is a deficient number, since it is larger than the sum of its proper divisors (376931).

40320061 is a wasteful number, since it uses less digits than its factorization.

40320061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376930.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 40320061 is about 6349.8079498517. The cubic root of 40320061 is about 342.9049282190.

Adding to 40320061 its reverse (16002304), we get a palindrome (56322365).

The spelling of 40320061 in words is "forty million, three hundred twenty thousand, sixty-one".