42976409 has 16 divisors (see below), whose sum is σ = 50232960. Its totient is φ = 36009600.

The previous prime is 42976399. The next prime is 42976429. The reversal of 42976409 is 90467924.

42976409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42976409 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42976429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62582 + ... + 63264.

It is an arithmetic number, because the mean of its divisors is an integer number (3139560).

Almost surely, 2^42976409 is an apocalyptic number.

It is an amenable number.

42976409 is a deficient number, since it is larger than the sum of its proper divisors (7256551).

42976409 is a wasteful number, since it uses less digits than its factorization.

42976409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 880.

The product of its (nonzero) digits is 108864, while the sum is 41.

The square root of 42976409 is about 6555.6394806304. The cubic root of 42976409 is about 350.2757255870.

The spelling of 42976409 in words is "forty-two million, nine hundred seventy-six thousand, four hundred nine".