997879585 has 8 divisors (see below), whose sum is σ = 1202596200. Its totient is φ = 794876544.

The previous prime is 997879537. The next prime is 997879591. The reversal of 997879585 is 585978799.

997879585 = T₂₅₇₉₁ + T₂₅₇₉₂ + T₂₅₇₉₃.

It can be written as a sum of positive squares in 4 ways, for example, as 77841 + 997801744 = 279^2 + 31588^2 .

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 997879585 - 2¹¹ = 997877537 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 997879585.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 427110 + ... + 429439.

It is an arithmetic number, because the mean of its divisors is an integer number (150324525).

Almost surely, 2^997879585 is an apocalyptic number.

997879585 is the 25793-rd centered triangular number.

It is an amenable number.

997879585 is a deficient number, since it is larger than the sum of its proper divisors (204716615).

997879585 is a wasteful number, since it uses less digits than its factorization.

997879585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 856787.

The product of its digits is 57153600, while the sum is 67.

The square root of 997879585 is about 31589.2321052602. The cubic root of 997879585 is about 999.2926948374.

The spelling of 997879585 in words is "nine hundred ninety-seven million, eight hundred seventy-nine thousand, five hundred eighty-five".