3618921 has 4 divisors (see below), whose sum is σ = 4825232. Its totient is φ = 2412612.

The previous prime is 3618919. The next prime is 3618929. The reversal of 3618921 is 1298163.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1298163 = 3 ⋅432721.

It is not a de Polignac number, because 3618921 - 2¹ = 3618919 is a prime.

It is a D-number.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

3618921 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3618929) 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, 603151 + ... + 603156.

It is an arithmetic number, because the mean of its divisors is an integer number (1206308).

Almost surely, 2^3618921 is an apocalyptic number.

It is an amenable number.

3618921 is a deficient number, since it is larger than the sum of its proper divisors (1206311).

3618921 is a wasteful number, since it uses less digits than its factorization.

3618921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1206310.

The product of its digits is 2592, while the sum is 30.

The square root of 3618921 is about 1902.3461830067. The cubic root of 3618921 is about 153.5299237499.

The spelling of 3618921 in words is "three million, six hundred eighteen thousand, nine hundred twenty-one".