997290402 has 8 divisors (see below), whose sum is σ = 1994580816. Its totient is φ = 332430132.

The previous prime is 997290383. The next prime is 997290407. The reversal of 997290402 is 204092799.

It is a sphenic number, since it is the product of 3 distinct primes.

997290402 is an admirable number.

It is a super-3 number, since 3×997290402³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (997290407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83107528 + ... + 83107539.

It is an arithmetic number, because the mean of its divisors is an integer number (249322602).

Almost surely, 2^997290402 is an apocalyptic number.

997290402 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

997290402 is a wasteful number, since it uses less digits than its factorization.

997290402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166215072.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 997290402 is about 31579.9050346894. The cubic root of 997290402 is about 999.0959836674.

The spelling of 997290402 in words is "nine hundred ninety-seven million, two hundred ninety thousand, four hundred two".