3491640 has 128 divisors (see below), whose sum is σ = 12052800. Its totient is φ = 898560.

The previous prime is 3491639. The next prime is 3491651. The reversal of 3491640 is 461943.

3491640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 57210 + ... + 57270.

Almost surely, 2^3491640 is an apocalyptic number.

3491640 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 3491640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6026400).

3491640 is an abundant number, since it is smaller than the sum of its proper divisors (8561160).

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

3491640 is a wasteful number, since it uses less digits than its factorization.

3491640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134 (or 124 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 3491640 is about 1868.5930536101. The cubic root of 3491640 is about 151.7084670573.

The spelling of 3491640 in words is "three million, four hundred ninety-one thousand, six hundred forty".