40356397 has 2 divisors, whose sum is σ = 40356398. Its totient is φ = 40356396.

The previous prime is 40356391. The next prime is 40356431. The reversal of 40356397 is 79365304.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40271716 + 84681 = 6346^2 + 291^2 .

It is a cyclic number.

It is not a de Polignac number, because 40356397 - 2¹⁵ = 40323629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40356391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20178198 + 20178199.

It is an arithmetic number, because the mean of its divisors is an integer number (20178199).

Almost surely, 2^40356397 is an apocalyptic number.

It is an amenable number.

40356397 is a deficient number, since it is larger than the sum of its proper divisors (1).

40356397 is an equidigital number, since it uses as much as digits as its factorization.

40356397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68040, while the sum is 37.

The square root of 40356397 is about 6352.6684944203. The cubic root of 40356397 is about 343.0079046874.

The spelling of 40356397 in words is "forty million, three hundred fifty-six thousand, three hundred ninety-seven".