3780521 has 2 divisors, whose sum is σ = 3780522. Its totient is φ = 3780520.

The previous prime is 3780509. The next prime is 3780541. The reversal of 3780521 is 1250873.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2190400 + 1590121 = 1480^2 + 1261^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3780521 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (3780541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1890260 + 1890261.

It is an arithmetic number, because the mean of its divisors is an integer number (1890261).

Almost surely, 2^3780521 is an apocalyptic number.

It is an amenable number.

3780521 is a deficient number, since it is larger than the sum of its proper divisors (1).

3780521 is an equidigital number, since it uses as much as digits as its factorization.

3780521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 3780521 is about 1944.3561916480. The cubic root of 3780521 is about 155.7819795771.

The spelling of 3780521 in words is "three million, seven hundred eighty thousand, five hundred twenty-one".