3720389 has 4 divisors (see below), whose sum is σ = 3727200. Its totient is φ = 3713580.

The previous prime is 3720383. The next prime is 3720391. The reversal of 3720389 is 9830273.

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: 9830273 = 43 ⋅228611.

It is a cyclic number.

It is not a de Polignac number, because 3720389 - 2⁴ = 3720373 is a prime.

It is a super-2 number, since 2×3720389² = 27682588622642, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3720383) 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, 2507 + ... + 3704.

It is an arithmetic number, because the mean of its divisors is an integer number (931800).

Almost surely, 2^3720389 is an apocalyptic number.

It is an amenable number.

3720389 is a deficient number, since it is larger than the sum of its proper divisors (6811).

3720389 is an equidigital number, since it uses as much as digits as its factorization.

3720389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6810.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 3720389 is about 1928.8309931147. The cubic root of 3720389 is about 154.9516186148.

The spelling of 3720389 in words is "three million, seven hundred twenty thousand, three hundred eighty-nine".