997749142 has 32 divisors (see below), whose sum is σ = 1727181792. Its totient is φ = 428173824.

The previous prime is 997749097. The next prime is 997749143. The reversal of 997749142 is 241947799.

It is a self number, because there is not a number n which added to its sum of digits gives 997749142.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997749143) by changing a digit.

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, 23088 + ... + 50284.

It is an arithmetic number, because the mean of its divisors is an integer number (53974431).

Almost surely, 2^997749142 is an apocalyptic number.

997749142 is a deficient number, since it is larger than the sum of its proper divisors (729432650).

997749142 is a wasteful number, since it uses less digits than its factorization.

997749142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27312.

The product of its digits is 1143072, while the sum is 52.

The square root of 997749142 is about 31587.1673627123. The cubic root of 997749142 is about 999.2491503659.

The spelling of 997749142 in words is "nine hundred ninety-seven million, seven hundred forty-nine thousand, one hundred forty-two".