13778355 has 16 divisors (see below), whose sum is σ = 22096800. Its totient is φ = 7331328.

The previous prime is 13778351. The next prime is 13778389. The reversal of 13778355 is 55387731.

It is not a de Polignac number, because 13778355 - 2² = 13778351 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13778351) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8121 + ... + 9669.

It is an arithmetic number, because the mean of its divisors is an integer number (1381050).

Almost surely, 2^13778355 is an apocalyptic number.

13778355 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

13778355 is a deficient number, since it is larger than the sum of its proper divisors (8318445).

13778355 is a wasteful number, since it uses less digits than its factorization.

13778355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2150.

The product of its digits is 88200, while the sum is 39.

The square root of 13778355 is about 3711.9206618677. The cubic root of 13778355 is about 239.7355594314.

The spelling of 13778355 in words is "thirteen million, seven hundred seventy-eight thousand, three hundred fifty-five".