40102397 has 4 divisors (see below), whose sum is σ = 40859100. Its totient is φ = 39345696.

The previous prime is 40102393. The next prime is 40102411. The reversal of 40102397 is 79320104.

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 19545241 + 20557156 = 4421^2 + 4534^2 .

It is a cyclic number.

It is not a de Polignac number, because 40102397 - 2² = 40102393 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40102393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 378272 + ... + 378377.

It is an arithmetic number, because the mean of its divisors is an integer number (10214775).

Almost surely, 2^40102397 is an apocalyptic number.

It is an amenable number.

40102397 is a deficient number, since it is larger than the sum of its proper divisors (756703).

40102397 is an equidigital number, since it uses as much as digits as its factorization.

40102397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 756702.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 40102397 is about 6332.6453398244. The cubic root of 40102397 is about 342.2867680152.

The spelling of 40102397 in words is "forty million, one hundred two thousand, three hundred ninety-seven".