406648397 has 2 divisors, whose sum is σ = 406648398. Its totient is φ = 406648396.

The previous prime is 406648367. The next prime is 406648399. The reversal of 406648397 is 793846604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 377369476 + 29278921 = 19426^2 + 5411^2 .

It is a cyclic number.

It is not a de Polignac number, because 406648397 - 2¹⁴ = 406632013 is a prime.

Together with 406648399, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (406648399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203324198 + 203324199.

It is an arithmetic number, because the mean of its divisors is an integer number (203324199).

Almost surely, 2^406648397 is an apocalyptic number.

It is an amenable number.

406648397 is a deficient number, since it is larger than the sum of its proper divisors (1).

406648397 is an equidigital number, since it uses as much as digits as its factorization.

406648397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 870912, while the sum is 47.

The square root of 406648397 is about 20165.5249621724. The cubic root of 406648397 is about 740.8660404751.

The spelling of 406648397 in words is "four hundred six million, six hundred forty-eight thousand, three hundred ninety-seven".