997396217390 has 32 divisors (see below), whose sum is σ = 1877599305216. Its totient is φ = 380750999200.

The previous prime is 997396217371. The next prime is 997396217429. The reversal of 997396217390 is 93712693799.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4792586 + ... + 4996365.

It is an arithmetic number, because the mean of its divisors is an integer number (58674978288).

Almost surely, 2^997396217390 is an apocalyptic number.

997396217390 is a deficient number, since it is larger than the sum of its proper divisors (880203087826).

997396217390 is a wasteful number, since it uses less digits than its factorization.

997396217390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9789424.

The product of its (nonzero) digits is 34720812, while the sum is 65.

The spelling of 997396217390 in words is "nine hundred ninety-seven billion, three hundred ninety-six million, two hundred seventeen thousand, three hundred ninety".