398447407 has 2 divisors, whose sum is σ = 398447408. Its totient is φ = 398447406.

The previous prime is 398447333. The next prime is 398447447. The reversal of 398447407 is 704744893.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-398447407 is a prime.

It is a super-2 number, since 2×398447407² = 317520672290047298, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398447447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199223703 + 199223704.

It is an arithmetic number, because the mean of its divisors is an integer number (199223704).

Almost surely, 2^398447407 is an apocalyptic number.

398447407 is a deficient number, since it is larger than the sum of its proper divisors (1).

398447407 is an equidigital number, since it uses as much as digits as its factorization.

398447407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 677376, while the sum is 46.

The square root of 398447407 is about 19961.1474369586. The cubic root of 398447407 is about 735.8517634026.

The spelling of 398447407 in words is "three hundred ninety-eight million, four hundred forty-seven thousand, four hundred seven".