3721890 has 32 divisors (see below), whose sum is σ = 9031680. Its totient is φ = 981504.

The previous prime is 3721877. The next prime is 3721901. The reversal of 3721890 is 981273.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2271 + ... + 3549.

It is an arithmetic number, because the mean of its divisors is an integer number (282240).

Almost surely, 2^3721890 is an apocalyptic number.

3721890 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

3721890 is an abundant number, since it is smaller than the sum of its proper divisors (5309790).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3721890 is a wasteful number, since it uses less digits than its factorization.

3721890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1386.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 3721890 is about 1929.2200496574. The cubic root of 3721890 is about 154.9724543489.

The spelling of 3721890 in words is "three million, seven hundred twenty-one thousand, eight hundred ninety".