39213240 has 128 divisors (see below), whose sum is σ = 130705920. Its totient is φ = 9331200.

The previous prime is 39213221. The next prime is 39213241. The reversal of 39213240 is 4231293.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 39213240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39213241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 80277 + ... + 80763.

It is an arithmetic number, because the mean of its divisors is an integer number (1021140).

Almost surely, 2^39213240 is an apocalyptic number.

39213240 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 39213240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65352960).

39213240 is an abundant number, since it is smaller than the sum of its proper divisors (91492680).

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

39213240 is a wasteful number, since it uses less digits than its factorization.

39213240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573 (or 569 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 39213240 is about 6262.0475884490. The cubic root of 39213240 is about 339.7380912626.

The spelling of 39213240 in words is "thirty-nine million, two hundred thirteen thousand, two hundred forty".