997654440 has 64 divisors (see below), whose sum is σ = 3123100800. Its totient is φ = 254473472.

The previous prime is 997654429. The next prime is 997654447. The reversal of 997654440 is 44456799.

It is a happy number.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 997654440.

It is not an unprimeable number, because it can be changed into a prime (997654447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 177975 + ... + 183494.

It is an arithmetic number, because the mean of its divisors is an integer number (48798450).

Almost surely, 2^997654440 is an apocalyptic number.

It is an amenable number.

997654440 is an abundant number, since it is smaller than the sum of its proper divisors (2125446360).

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

997654440 is a wasteful number, since it uses less digits than its factorization.

997654440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361506 (or 361502 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 48.

The square root of 997654440 is about 31585.6682690109. The cubic root of 997654440 is about 999.2175345742.

The spelling of 997654440 in words is "nine hundred ninety-seven million, six hundred fifty-four thousand, four hundred forty".