40078797 has 16 divisors (see below), whose sum is σ = 59169792. Its totient is φ = 23926320.

The previous prime is 40078793. The next prime is 40078813. The reversal of 40078797 is 79787004.

It is not a de Polignac number, because 40078797 - 2² = 40078793 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 6853 + ... + 11274.

It is an arithmetic number, because the mean of its divisors is an integer number (3698112).

Almost surely, 2^40078797 is an apocalyptic number.

It is an amenable number.

40078797 is a deficient number, since it is larger than the sum of its proper divisors (19090995).

40078797 is a wasteful number, since it uses less digits than its factorization.

40078797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18208.

The product of its (nonzero) digits is 98784, while the sum is 42.

The square root of 40078797 is about 6330.7817052873. The cubic root of 40078797 is about 342.2196103267.

It can be divided in two parts, 400 and 78797, that added together give a palindrome (79197).

The spelling of 40078797 in words is "forty million, seventy-eight thousand, seven hundred ninety-seven".