40401397 has 2 divisors, whose sum is σ = 40401398. Its totient is φ = 40401396.

The previous prime is 40401377. The next prime is 40401421. The reversal of 40401397 is 79310404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38118276 + 2283121 = 6174^2 + 1511^2 .

It is a cyclic number.

It is not a de Polignac number, because 40401397 - 2²³ = 32012789 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40401377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20200698 + 20200699.

It is an arithmetic number, because the mean of its divisors is an integer number (20200699).

Almost surely, 2^40401397 is an apocalyptic number.

It is an amenable number.

40401397 is a deficient number, since it is larger than the sum of its proper divisors (1).

40401397 is an equidigital number, since it uses as much as digits as its factorization.

40401397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 40401397 is about 6356.2093263202. The cubic root of 40401397 is about 343.1353493494.

The spelling of 40401397 in words is "forty million, four hundred one thousand, three hundred ninety-seven".