40078851 has 4 divisors (see below), whose sum is σ = 53438472. Its totient is φ = 26719232.

The previous prime is 40078849. The next prime is 40078897. The reversal of 40078851 is 15887004.

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 40078851 - 2¹ = 40078849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40078651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6679806 + ... + 6679811.

It is an arithmetic number, because the mean of its divisors is an integer number (13359618).

Almost surely, 2^40078851 is an apocalyptic number.

40078851 is a deficient number, since it is larger than the sum of its proper divisors (13359621).

40078851 is a wasteful number, since it uses less digits than its factorization.

40078851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13359620.

The product of its (nonzero) digits is 8960, while the sum is 33.

The square root of 40078851 is about 6330.7859701620. The cubic root of 40078851 is about 342.2197640227.

The spelling of 40078851 in words is "forty million, seventy-eight thousand, eight hundred fifty-one".