2661398 has 4 divisors (see below), whose sum is σ = 3992100. Its totient is φ = 1330698.

The previous prime is 2661397. The next prime is 2661403. The reversal of 2661398 is 8931662.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8931662 = 2 ⋅4465831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665348 + ... + 665351.

It is an arithmetic number, because the mean of its divisors is an integer number (998025).

2^2661398 is an apocalyptic number.

2661398 is a deficient number, since it is larger than the sum of its proper divisors (1330702).

2661398 is a wasteful number, since it uses less digits than its factorization.

2661398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1330701.

The product of its digits is 15552, while the sum is 35.

The square root of 2661398 is about 1631.3791711310. The cubic root of 2661398 is about 138.5808674216.

The spelling of 2661398 in words is "two million, six hundred sixty-one thousand, three hundred ninety-eight".