3654991 has 4 divisors (see below), whose sum is σ = 3717000. Its totient is φ = 3592984.

The previous prime is 3654961. The next prime is 3654997. The reversal of 3654991 is 1994563.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3654991 - 2²¹ = 1557839 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3654991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3654997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30916 + ... + 31033.

It is an arithmetic number, because the mean of its divisors is an integer number (929250).

Almost surely, 2^3654991 is an apocalyptic number.

3654991 is a deficient number, since it is larger than the sum of its proper divisors (62009).

3654991 is an equidigital number, since it uses as much as digits as its factorization.

3654991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62008.

The product of its digits is 29160, while the sum is 37.

The square root of 3654991 is about 1911.8030756331. The cubic root of 3654991 is about 154.0383190190.

It can be divided in two parts, 365 and 4991, that added together give a triangular number (5356 = T₁₀₃).

The spelling of 3654991 in words is "three million, six hundred fifty-four thousand, nine hundred ninety-one".