997290407 has 2 divisors, whose sum is σ = 997290408. Its totient is φ = 997290406.

The previous prime is 997290383. The next prime is 997290409. The reversal of 997290407 is 704092799.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-997290407 is a prime.

Together with 997290409, 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 (997290409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498645203 + 498645204.

It is an arithmetic number, because the mean of its divisors is an integer number (498645204).

Almost surely, 2^997290407 is an apocalyptic number.

997290407 is a deficient number, since it is larger than the sum of its proper divisors (1).

997290407 is an equidigital number, since it uses as much as digits as its factorization.

997290407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 285768, while the sum is 47.

The square root of 997290407 is about 31579.9051138537. The cubic root of 997290407 is about 999.0959853371.

The spelling of 997290407 in words is "nine hundred ninety-seven million, two hundred ninety thousand, four hundred seven".