2678398 has 4 divisors (see below), whose sum is σ = 4017600. Its totient is φ = 1339198.

The previous prime is 2678387. The next prime is 2678399. The reversal of 2678398 is 8938762.

It is a semiprime because it is the product of two primes.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2678399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 669598 + ... + 669601.

It is an arithmetic number, because the mean of its divisors is an integer number (1004400).

2^2678398 is an apocalyptic number.

2678398 is a deficient number, since it is larger than the sum of its proper divisors (1339202).

2678398 is a wasteful number, since it uses less digits than its factorization.

2678398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1339201.

The product of its digits is 145152, while the sum is 43.

The square root of 2678398 is about 1636.5811926085. The cubic root of 2678398 is about 138.8753087048.

The spelling of 2678398 in words is "two million, six hundred seventy-eight thousand, three hundred ninety-eight".