13978142 has 4 divisors (see below), whose sum is σ = 20967216. Its totient is φ = 6989070.

The previous prime is 13978127. The next prime is 13978147. The reversal of 13978142 is 24187931.

13978142 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13978147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3494534 + ... + 3494537.

It is an arithmetic number, because the mean of its divisors is an integer number (5241804).

Almost surely, 2^13978142 is an apocalyptic number.

13978142 is a deficient number, since it is larger than the sum of its proper divisors (6989074).

13978142 is an equidigital number, since it uses as much as digits as its factorization.

13978142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6989073.

The product of its digits is 12096, while the sum is 35.

The square root of 13978142 is about 3738.7353476811. The cubic root of 13978142 is about 240.8887303936. Note that the first 3 decimals are identical.

The spelling of 13978142 in words is "thirteen million, nine hundred seventy-eight thousand, one hundred forty-two".