3781020 has 96 divisors (see below), whose sum is σ = 11430720. Its totient is φ = 931840.

The previous prime is 3781007. The next prime is 3781079. The reversal of 3781020 is 201873.

3781020 = T₁₅₂ + T₁₅₃ + ... + T₂₉₆.

It is a super-2 number, since 2×3781020² = 28592224480800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 71314 + ... + 71366.

It is an arithmetic number, because the mean of its divisors is an integer number (119070).

Almost surely, 2^3781020 is an apocalyptic number.

3781020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3781020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5715360).

3781020 is an abundant number, since it is smaller than the sum of its proper divisors (7649700).

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

3781020 is a wasteful number, since it uses less digits than its factorization.

3781020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135 (or 133 counting only the distinct ones).

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

The square root of 3781020 is about 1944.4845075238. The cubic root of 3781020 is about 155.7888332874.

Adding to 3781020 its reverse (201873), we get a palindrome (3982893).

The spelling of 3781020 in words is "three million, seven hundred eighty-one thousand, twenty".