42909657 has 64 divisors (see below), whose sum is σ = 73328640. Its totient is φ = 21772800.

The previous prime is 42909653. The next prime is 42909679. The reversal of 42909657 is 75690924.

It is not a de Polignac number, because 42909657 - 2² = 42909653 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42909653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 703407 + ... + 703467.

It is an arithmetic number, because the mean of its divisors is an integer number (1145760).

Almost surely, 2^42909657 is an apocalyptic number.

It is an amenable number.

42909657 is a deficient number, since it is larger than the sum of its proper divisors (30418983).

42909657 is a wasteful number, since it uses less digits than its factorization.

42909657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174.

The product of its (nonzero) digits is 136080, while the sum is 42.

The square root of 42909657 is about 6550.5463130948. The cubic root of 42909657 is about 350.0942793636.

The spelling of 42909657 in words is "forty-two million, nine hundred nine thousand, six hundred fifty-seven".