3640140 has 144 divisors (see below), whose sum is σ = 13208832. Its totient is φ = 824256.

The previous prime is 3640121. The next prime is 3640151. The reversal of 3640140 is 410463.

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 33967 + ... + 34073.

It is an arithmetic number, because the mean of its divisors is an integer number (91728).

Almost surely, 2^3640140 is an apocalyptic number.

3640140 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 3640140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6604416).

3640140 is an abundant number, since it is smaller than the sum of its proper divisors (9568692).

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

3640140 is a wasteful number, since it uses less digits than its factorization.

3640140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138 (or 124 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 3640140 is about 1907.9150924504. The cubic root of 3640140 is about 153.8294057409.

The spelling of 3640140 in words is "three million, six hundred forty thousand, one hundred forty".