3731781 has 4 divisors (see below), whose sum is σ = 4975712. Its totient is φ = 2487852.

The previous prime is 3731759. The next prime is 3731801. The reversal of 3731781 is 1871373.

3731781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is not a de Polignac number, because 3731781 - 2¹³ = 3723589 is a prime.

It is a super-2 number, since 2×3731781² = 27852378863922, which contains 22 as substring.

It is an Ulam number.

It is a D-number.

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 (3731701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 621961 + ... + 621966.

It is an arithmetic number, because the mean of its divisors is an integer number (1243928).

Almost surely, 2^3731781 is an apocalyptic number.

It is an amenable number.

3731781 is a deficient number, since it is larger than the sum of its proper divisors (1243931).

3731781 is a wasteful number, since it uses less digits than its factorization.

3731781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1243930.

The product of its digits is 3528, while the sum is 30.

The square root of 3731781 is about 1931.7818199786. The cubic root of 3731781 is about 155.1096137583.

The spelling of 3731781 in words is "three million, seven hundred thirty-one thousand, seven hundred eighty-one".