997436394 has 12 divisors (see below), whose sum is σ = 2161112226. Its totient is φ = 332478792.

The previous prime is 997436387. The next prime is 997436399. The reversal of 997436394 is 493634799.

It can be written as a sum of positive squares in only one way, i.e., 515063025 + 482373369 = 22695^2 + 21963^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 997436394.

It is not an unprimeable number, because it can be changed into a prime (997436399) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27706549 + ... + 27706584.

Almost surely, 2^997436394 is an apocalyptic number.

997436394 is an abundant number, since it is smaller than the sum of its proper divisors (1163675832).

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

997436394 is a wasteful number, since it uses less digits than its factorization.

997436394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55413141 (or 55413138 counting only the distinct ones).

The product of its digits is 4408992, while the sum is 54.

The square root of 997436394 is about 31582.2164200045. The cubic root of 997436394 is about 999.1447333942.

The spelling of 997436394 in words is "nine hundred ninety-seven million, four hundred thirty-six thousand, three hundred ninety-four".