40278097 has 4 divisors (see below), whose sum is σ = 40304740. Its totient is φ = 40251456.

The previous prime is 40278079. The next prime is 40278101. The reversal of 40278097 is 79087204.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23435281 + 16842816 = 4841^2 + 4104^2 .

It is a cyclic number.

It is not a de Polignac number, because 40278097 - 2¹⁵ = 40245329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40275097) 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, 10908 + ... + 14125.

It is an arithmetic number, because the mean of its divisors is an integer number (10076185).

Almost surely, 2^40278097 is an apocalyptic number.

It is an amenable number.

40278097 is a deficient number, since it is larger than the sum of its proper divisors (26643).

40278097 is a wasteful number, since it uses less digits than its factorization.

40278097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26642.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 40278097 is about 6346.5027377289. The cubic root of 40278097 is about 342.7859249481.

The spelling of 40278097 in words is "forty million, two hundred seventy-eight thousand, ninety-seven".