2638397 has 4 divisors (see below), whose sum is σ = 2777280. Its totient is φ = 2499516.

The previous prime is 2638381. The next prime is 2638403. The reversal of 2638397 is 7938362.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7938362 = 2 ⋅3969181.

It is a cyclic number.

It is not a de Polignac number, because 2638397 - 2⁴ = 2638381 is a prime.

It is a super-2 number, since 2×2638397² = 13922277459218, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2638397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2638327) 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, 69413 + ... + 69450.

It is an arithmetic number, because the mean of its divisors is an integer number (694320).

2^2638397 is an apocalyptic number.

It is an amenable number.

2638397 is a deficient number, since it is larger than the sum of its proper divisors (138883).

2638397 is a wasteful number, since it uses less digits than its factorization.

2638397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138882.

The product of its digits is 54432, while the sum is 38.

The square root of 2638397 is about 1624.3143168734. The cubic root of 2638397 is about 138.1804856829.

The spelling of 2638397 in words is "two million, six hundred thirty-eight thousand, three hundred ninety-seven".