3640919 has 8 divisors (see below), whose sum is σ = 3781248. Its totient is φ = 3502080.

The previous prime is 3640909. The next prime is 3640933. The reversal of 3640919 is 9190463.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3640919 is a prime.

It is a super-2 number, since 2×3640919² = 26512582329122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3640909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7739 + ... + 8195.

It is an arithmetic number, because the mean of its divisors is an integer number (472656).

Almost surely, 2^3640919 is an apocalyptic number.

3640919 is a deficient number, since it is larger than the sum of its proper divisors (140329).

3640919 is a wasteful number, since it uses less digits than its factorization.

3640919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 3640919 is about 1908.1192310755. The cubic root of 3640919 is about 153.8403782639.

Adding to 3640919 its sum of digits (32), we get a triangular number (3640951 = T₂₆₉₈).

The spelling of 3640919 in words is "three million, six hundred forty thousand, nine hundred nineteen".