42126780739 has 4 divisors (see below), whose sum is σ = 42543877680. Its totient is φ = 41709683800.

The previous prime is 42126780673. The next prime is 42126780769. The reversal of 42126780739 is 93708762124.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42126780739 - 2¹¹ = 42126778691 is a prime.

It is a super-2 number, since 2×42126780739² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42126780692 and 42126780701.

It is not an unprimeable number, because it can be changed into a prime (42126780769) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 208548319 + ... + 208548520.

It is an arithmetic number, because the mean of its divisors is an integer number (10635969420).

Almost surely, 2^42126780739 is an apocalyptic number.

42126780739 is a deficient number, since it is larger than the sum of its proper divisors (417096941).

42126780739 is a wasteful number, since it uses less digits than its factorization.

42126780739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417096940.

The product of its (nonzero) digits is 1016064, while the sum is 49.

The spelling of 42126780739 in words is "forty-two billion, one hundred twenty-six million, seven hundred eighty thousand, seven hundred thirty-nine".