42680391 has 16 divisors (see below), whose sum is σ = 61409376. Its totient is φ = 26211456.

The previous prime is 42680389. The next prime is 42680401. The reversal of 42680391 is 19308624.

It is not a de Polignac number, because 42680391 - 2¹ = 42680389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42680321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27841 + ... + 29333.

It is an arithmetic number, because the mean of its divisors is an integer number (3838086).

Almost surely, 2^42680391 is an apocalyptic number.

42680391 is a deficient number, since it is larger than the sum of its proper divisors (18728985).

42680391 is a wasteful number, since it uses less digits than its factorization.

42680391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2242.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 42680391 is about 6533.0231133833. The cubic root of 42680391 is about 349.4696484702.

It can be divided in two parts, 42680 and 391, that added together give a triangular number (43071 = T₂₉₃).

The spelling of 42680391 in words is "forty-two million, six hundred eighty thousand, three hundred ninety-one".