13212540 has 72 divisors (see below), whose sum is σ = 43728048. Its totient is φ = 3202560.

The previous prime is 13212533. The next prime is 13212547. The reversal of 13212540 is 4521231.

It is an interprime number because it is at equal distance from previous prime (13212533) and next prime (13212547).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13212547) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1357 + ... + 5316.

It is an arithmetic number, because the mean of its divisors is an integer number (607334).

Almost surely, 2^13212540 is an apocalyptic number.

13212540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13212540 is an abundant number, since it is smaller than the sum of its proper divisors (30515508).

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

13212540 is a wasteful number, since it uses less digits than its factorization.

13212540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6699 (or 6694 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 13212540 is about 3634.9057759452. The cubic root of 13212540 is about 236.4079652379.

Adding to 13212540 its reverse (4521231), we get a palindrome (17733771).

The spelling of 13212540 in words is "thirteen million, two hundred twelve thousand, five hundred forty".