13940478 has 16 divisors (see below), whose sum is σ = 30978960. Its totient is φ = 4646808.

The previous prime is 13940477. The next prime is 13940491. The reversal of 13940478 is 87404931.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13940473) 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, 129025 + ... + 129132.

It is an arithmetic number, because the mean of its divisors is an integer number (1936185).

Almost surely, 2^13940478 is an apocalyptic number.

13940478 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

13940478 is an abundant number, since it is smaller than the sum of its proper divisors (17038482).

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

13940478 is a wasteful number, since it uses less digits than its factorization.

13940478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258168 (or 258162 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 13940478 is about 3733.6949527244. The cubic root of 13940478 is about 240.6721781447.

The spelling of 13940478 in words is "thirteen million, nine hundred forty thousand, four hundred seventy-eight".