997905377 has 8 divisors (see below), whose sum is σ = 1140713856. Its totient is φ = 855159552.

The previous prime is 997905367. The next prime is 997905383. The reversal of 997905377 is 773509799.

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

It is a cyclic number.

It is not a de Polignac number, because 997905377 - 2⁴ = 997905361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997905367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25793 + ... + 51585.

It is an arithmetic number, because the mean of its divisors is an integer number (142589232).

Almost surely, 2^997905377 is an apocalyptic number.

997905377 is the 25793-rd pentagonal number.

It is an amenable number.

997905377 is a deficient number, since it is larger than the sum of its proper divisors (142808479).

997905377 is a wasteful number, since it uses less digits than its factorization.

997905377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31327.

The product of its (nonzero) digits is 3750705, while the sum is 56.

The square root of 997905377 is about 31589.6403429985. The cubic root of 997905377 is about 999.3013042713.

The spelling of 997905377 in words is "nine hundred ninety-seven million, nine hundred five thousand, three hundred seventy-seven".