3720081 has 4 divisors (see below), whose sum is σ = 4960112. Its totient is φ = 2480052.

The previous prime is 3720037. The next prime is 3720103. The reversal of 3720081 is 1800273.

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: 1800273 = 3 ⋅600091.

It is not a de Polignac number, because 3720081 - 2¹⁰ = 3719057 is a prime.

It is a super-2 number, since 2×3720081² = 27678005293122, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3720011) 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, 620011 + ... + 620016.

It is an arithmetic number, because the mean of its divisors is an integer number (1240028).

Almost surely, 2^3720081 is an apocalyptic number.

It is an amenable number.

3720081 is a deficient number, since it is larger than the sum of its proper divisors (1240031).

3720081 is a wasteful number, since it uses less digits than its factorization.

3720081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1240030.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 3720081 is about 1928.7511503561. The cubic root of 3720081 is about 154.9473425014.

The spelling of 3720081 in words is "three million, seven hundred twenty thousand, eighty-one".