9661398 has 32 divisors (see below), whose sum is σ = 20152320. Its totient is φ = 3084480.

The previous prime is 9661397. The next prime is 9661409. The reversal of 9661398 is 8931669.

It is a super-2 number, since 2×9661398² = 186685222628808, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9661391) 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, 23418 + ... + 23826.

It is an arithmetic number, because the mean of its divisors is an integer number (629760).

Almost surely, 2^9661398 is an apocalyptic number.

9661398 is an abundant number, since it is smaller than the sum of its proper divisors (10490922).

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

9661398 is a wasteful number, since it uses less digits than its factorization.

9661398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572.

The product of its digits is 69984, while the sum is 42.

The square root of 9661398 is about 3108.2789450112. The cubic root of 9661398 is about 212.9838423680.

The spelling of 9661398 in words is "nine million, six hundred sixty-one thousand, three hundred ninety-eight".