997771398 has 32 divisors (see below), whose sum is σ = 2199031296. Its totient is φ = 299865888.

The previous prime is 997771381. The next prime is 997771409. The reversal of 997771398 is 893177799.

It is a happy number.

997771398 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145390 + ... + 152097.

It is an arithmetic number, because the mean of its divisors is an integer number (68719728).

Almost surely, 2^997771398 is an apocalyptic number.

997771398 is an abundant number, since it is smaller than the sum of its proper divisors (1201259898).

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

997771398 is a wasteful number, since it uses less digits than its factorization.

997771398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297548.

The product of its digits is 6001128, while the sum is 60.

The square root of 997771398 is about 31587.5196557121. The cubic root of 997771398 is about 999.2565801305.

The spelling of 997771398 in words is "nine hundred ninety-seven million, seven hundred seventy-one thousand, three hundred ninety-eight".