997770156 has 48 divisors (see below), whose sum is σ = 2388204000. Its totient is φ = 324093952.

The previous prime is 997770139. The next prime is 997770173. The reversal of 997770156 is 651077799.

It is an interprime number because it is at equal distance from previous prime (997770139) and next prime (997770173).

It is a junction number, because it is equal to n+sod(n) for n = 997770099 and 997770108.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89500 + ... + 100028.

It is an arithmetic number, because the mean of its divisors is an integer number (49754250).

Almost surely, 2^997770156 is an apocalyptic number.

It is a pronic number, being equal to 31587×31588.

It is an amenable number.

997770156 is an abundant number, since it is smaller than the sum of its proper divisors (1390433844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

997770156 is a wasteful number, since it uses less digits than its factorization.

997770156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10738 (or 10736 counting only the distinct ones).

The product of its (nonzero) digits is 833490, while the sum is 51.

The square root of 997770156 is about 31587.4999960427. The cubic root of 997770156 is about 999.2561655141.

The spelling of 997770156 in words is "nine hundred ninety-seven million, seven hundred seventy thousand, one hundred fifty-six".