13778238 has 16 divisors (see below), whose sum is σ = 28143360. Its totient is φ = 4494936.

The previous prime is 13778231. The next prime is 13778267. The reversal of 13778238 is 83287731.

It is a junction number, because it is equal to n+sod(n) for n = 13778196 and 13778205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13778231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24148 + ... + 24711.

It is an arithmetic number, because the mean of its divisors is an integer number (1758960).

Almost surely, 2^13778238 is an apocalyptic number.

13778238 is an abundant number, since it is smaller than the sum of its proper divisors (14365122).

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

13778238 is a wasteful number, since it uses less digits than its factorization.

13778238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48911.

The product of its digits is 56448, while the sum is 39.

The square root of 13778238 is about 3711.9049017991. The cubic root of 13778238 is about 239.7348808516.

The spelling of 13778238 in words is "thirteen million, seven hundred seventy-eight thousand, two hundred thirty-eight".