42391839 has 16 divisors (see below), whose sum is σ = 64931328. Its totient is φ = 24098592.

The previous prime is 42391759. The next prime is 42391861. The reversal of 42391839 is 93819324.

It is not a de Polignac number, because 42391839 - 2¹² = 42387743 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42391797 and 42391806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42391879) 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, 987 + ... + 9260.

It is an arithmetic number, because the mean of its divisors is an integer number (4058208).

Almost surely, 2^42391839 is an apocalyptic number.

42391839 is a deficient number, since it is larger than the sum of its proper divisors (22539489).

42391839 is a wasteful number, since it uses less digits than its factorization.

42391839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10454.

The product of its digits is 46656, while the sum is 39.

The square root of 42391839 is about 6510.9015504767. The cubic root of 42391839 is about 348.6803064702.

The spelling of 42391839 in words is "forty-two million, three hundred ninety-one thousand, eight hundred thirty-nine".