3780121 has 4 divisors (see below), whose sum is σ = 3910500. Its totient is φ = 3649744.

The previous prime is 3780113. The next prime is 3780143. The reversal of 3780121 is 1210873.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1334025 + 2446096 = 1155^2 + 1564^2 .

It is a cyclic number.

It is not a de Polignac number, because 3780121 - 2³ = 3780113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3780092 and 3780101.

It is not an unprimeable number, because it can be changed into a prime (3780151) 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, 65146 + ... + 65203.

It is an arithmetic number, because the mean of its divisors is an integer number (977625).

Almost surely, 2^3780121 is an apocalyptic number.

It is an amenable number.

3780121 is a deficient number, since it is larger than the sum of its proper divisors (130379).

3780121 is a wasteful number, since it uses less digits than its factorization.

3780121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130378.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 3780121 is about 1944.2533271156. The cubic root of 3780121 is about 155.7764851854.

Adding to 3780121 its reverse (1210873), we get a palindrome (4990994).

The spelling of 3780121 in words is "three million, seven hundred eighty thousand, one hundred twenty-one".