997290401 has 8 divisors (see below), whose sum is σ = 1010892960. Its totient is φ = 983725792.

The previous prime is 997290383. The next prime is 997290407. The reversal of 997290401 is 104092799.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-997290401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997290407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45581 + ... + 63813.

It is an arithmetic number, because the mean of its divisors is an integer number (126361620).

Almost surely, 2^997290401 is an apocalyptic number.

997290401 is the 18233-rd octagonal number.

It is an amenable number.

997290401 is a deficient number, since it is larger than the sum of its proper divisors (13602559).

997290401 is a wasteful number, since it uses less digits than its factorization.

997290401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18975.

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 997290401 is about 31579.9050188565. The cubic root of 997290401 is about 999.0959833335.

The spelling of 997290401 in words is "nine hundred ninety-seven million, two hundred ninety thousand, four hundred one".