103991438 has 4 divisors (see below), whose sum is σ = 155987160. Its totient is φ = 51995718.

The previous prime is 103991429. The next prime is 103991449. The reversal of 103991438 is 834199301.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 834199301 = 13 ⋅64169177.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25997858 + ... + 25997861.

It is an arithmetic number, because the mean of its divisors is an integer number (38996790).

Almost surely, 2^103991438 is an apocalyptic number.

103991438 is a deficient number, since it is larger than the sum of its proper divisors (51995722).

103991438 is an equidigital number, since it uses as much as digits as its factorization.

103991438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51995721.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 103991438 is about 10197.6192319580. The cubic root of 103991438 is about 470.2540319800.

The spelling of 103991438 in words is "one hundred three million, nine hundred ninety-one thousand, four hundred thirty-eight".