13997540 has 24 divisors (see below), whose sum is σ = 30022272. Its totient is φ = 5479520.

The previous prime is 13997539. The next prime is 13997551. The reversal of 13997540 is 4579931.

It is a happy number.

It is a super-2 number, since 2×13997540² = 391862252103200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13997494 and 13997503.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6506 + ... + 8385.

It is an arithmetic number, because the mean of its divisors is an integer number (1250928).

Almost surely, 2^13997540 is an apocalyptic number.

13997540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13997540 is an abundant number, since it is smaller than the sum of its proper divisors (16024732).

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

13997540 is a wasteful number, since it uses less digits than its factorization.

13997540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14947 (or 14945 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 38.

The square root of 13997540 is about 3741.3286410044. The cubic root of 13997540 is about 241.0001090431. Note that the first 3 decimals are identical.

It can be divided in two parts, 139 and 97540, that added together give a palindrome (97679).

The spelling of 13997540 in words is "thirteen million, nine hundred ninety-seven thousand, five hundred forty".