40078115 has 32 divisors (see below), whose sum is σ = 61447680. Its totient is φ = 24364800.

The previous prime is 40078111. The next prime is 40078147. The reversal of 40078115 is 51187004.

It is not a de Polignac number, because 40078115 - 2² = 40078111 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40078111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14516 + ... + 17054.

It is an arithmetic number, because the mean of its divisors is an integer number (1920240).

Almost surely, 2^40078115 is an apocalyptic number.

40078115 is a deficient number, since it is larger than the sum of its proper divisors (21369565).

40078115 is a wasteful number, since it uses less digits than its factorization.

40078115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2603.

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 40078115 is about 6330.7278412517. The cubic root of 40078115 is about 342.2176691915.

Subtracting 40078115 from its reverse (51187004), we obtain a square (11108889 = 3333²).

The spelling of 40078115 in words is "forty million, seventy-eight thousand, one hundred fifteen".