36640397 has 4 divisors (see below), whose sum is σ = 37630716. Its totient is φ = 35650080.

The previous prime is 36640393. The next prime is 36640399. The reversal of 36640397 is 79304663.

It is a happy number.

36640397 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 35450116 + 1190281 = 5954^2 + 1091^2 .

It is a cyclic number.

It is not a de Polignac number, because 36640397 - 2² = 36640393 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 36640397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36640393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 495104 + ... + 495177.

It is an arithmetic number, because the mean of its divisors is an integer number (9407679).

Almost surely, 2^36640397 is an apocalyptic number.

36640397 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

It is an amenable number.

36640397 is a deficient number, since it is larger than the sum of its proper divisors (990319).

36640397 is an equidigital number, since it uses as much as digits as its factorization.

36640397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990318.

The product of its (nonzero) digits is 81648, while the sum is 38.

The square root of 36640397 is about 6053.1311732028. The cubic root of 36640397 is about 332.1391400385.

The spelling of 36640397 in words is "thirty-six million, six hundred forty thousand, three hundred ninety-seven".