13993578 has 12 divisors (see below), whose sum is σ = 30319458. Its totient is φ = 4664520.

The previous prime is 13993549. The next prime is 13993579. The reversal of 13993578 is 87539931.

It is a happy number.

13993578 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 9941409 + 4052169 = 3153^2 + 2013^2 .

It is not an unprimeable number, because it can be changed into a prime (13993579) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 388693 + ... + 388728.

Almost surely, 2^13993578 is an apocalyptic number.

13993578 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

13993578 is an abundant number, since it is smaller than the sum of its proper divisors (16325880).

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

13993578 is a wasteful number, since it uses less digits than its factorization.

13993578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 777429 (or 777426 counting only the distinct ones).

The product of its digits is 204120, while the sum is 45.

The square root of 13993578 is about 3740.7991124892. The cubic root of 13993578 is about 240.9773685583.

The spelling of 13993578 in words is "thirteen million, nine hundred ninety-three thousand, five hundred seventy-eight".