997840959 has 16 divisors (see below), whose sum is σ = 1409368320. Its totient is φ = 625806720.

The previous prime is 997840951. The next prime is 997840967. The reversal of 997840959 is 959048799.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (997840951) and next prime (997840967).

It is not a de Polignac number, because 997840959 - 2³ = 997840951 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997840951) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 179382 + ... + 184860.

It is an arithmetic number, because the mean of its divisors is an integer number (88085520).

Almost surely, 2^997840959 is an apocalyptic number.

997840959 is a deficient number, since it is larger than the sum of its proper divisors (411527361).

997840959 is a wasteful number, since it uses less digits than its factorization.

997840959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9070.

The product of its (nonzero) digits is 7348320, while the sum is 60.

The square root of 997840959 is about 31588.6207201264. The cubic root of 997840959 is about 999.2798011047.

The spelling of 997840959 in words is "nine hundred ninety-seven million, eight hundred forty thousand, nine hundred fifty-nine".