40078739 has 4 divisors (see below), whose sum is σ = 40129824. Its totient is φ = 40027656.

The previous prime is 40078729. The next prime is 40078781. The reversal of 40078739 is 93787004.

40078739 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 40078739 - 2⁸ = 40078483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40078729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24347 + ... + 25940.

It is an arithmetic number, because the mean of its divisors is an integer number (10032456).

Almost surely, 2^40078739 is an apocalyptic number.

40078739 is a deficient number, since it is larger than the sum of its proper divisors (51085).

40078739 is an equidigital number, since it uses as much as digits as its factorization.

40078739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51084.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 40078739 is about 6330.7771244927. Note that the first 3 decimals coincide. The cubic root of 40078739 is about 342.2194452457.

The spelling of 40078739 in words is "forty million, seventy-eight thousand, seven hundred thirty-nine".