42920391 has 8 divisors (see below), whose sum is σ = 57606784. Its totient is φ = 28423800.

The previous prime is 42920389. The next prime is 42920417. The reversal of 42920391 is 19302924.

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

It is not a de Polignac number, because 42920391 - 2¹ = 42920389 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 (42920351) 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, 46921 + ... + 47826.

It is an arithmetic number, because the mean of its divisors is an integer number (7200848).

Almost surely, 2^42920391 is an apocalyptic number.

42920391 is a deficient number, since it is larger than the sum of its proper divisors (14686393).

42920391 is a wasteful number, since it uses less digits than its factorization.

42920391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94901.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 42920391 is about 6551.3655828384. The cubic root of 42920391 is about 350.1234693638.

The spelling of 42920391 in words is "forty-two million, nine hundred twenty thousand, three hundred ninety-one".