40078791 has 12 divisors (see below), whose sum is σ = 58590168. Its totient is φ = 26396784.

The previous prime is 40078789. The next prime is 40078793. The reversal of 40078791 is 19787004.

It is an interprime number because it is at equal distance from previous prime (40078789) and next prime (40078793).

It is not a de Polignac number, because 40078791 - 2¹ = 40078789 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40078793) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26080 + ... + 27573.

It is an arithmetic number, because the mean of its divisors is an integer number (4882514).

Almost surely, 2^40078791 is an apocalyptic number.

40078791 is a deficient number, since it is larger than the sum of its proper divisors (18511377).

40078791 is a wasteful number, since it uses less digits than its factorization.

40078791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53742 (or 53739 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 40078791 is about 6330.7812314121. The cubic root of 40078791 is about 342.2195932494.

The spelling of 40078791 in words is "forty million, seventy-eight thousand, seven hundred ninety-one".