3251640 has 128 divisors (see below), whose sum is σ = 11520000. Its totient is φ = 733824.

The previous prime is 3251609. The next prime is 3251653. The reversal of 3251640 is 461523.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41121 + ... + 41199.

It is an arithmetic number, because the mean of its divisors is an integer number (90000).

Almost surely, 2^3251640 is an apocalyptic number.

3251640 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 3251640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5760000).

3251640 is an abundant number, since it is smaller than the sum of its proper divisors (8268360).

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

3251640 is a wasteful number, since it uses less digits than its factorization.

3251640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114 (or 96 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 3251640 is about 1803.2304345258. The cubic root of 3251640 is about 148.1497145822.

The spelling of 3251640 in words is "three million, two hundred fifty-one thousand, six hundred forty".