1375421 has 2 divisors, whose sum is σ = 1375422. Its totient is φ = 1375420.

The previous prime is 1375417. The next prime is 1375433. The reversal of 1375421 is 1245731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 972196 + 403225 = 986^2 + 635^2 .

It is a cyclic number.

It is not a de Polignac number, because 1375421 - 2² = 1375417 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1375411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 687710 + 687711.

It is an arithmetic number, because the mean of its divisors is an integer number (687711).

2^1375421 is an apocalyptic number.

It is an amenable number.

1375421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1375421 is an equidigital number, since it uses as much as digits as its factorization.

1375421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 840, while the sum is 23.

The square root of 1375421 is about 1172.7834412201. The cubic root of 1375421 is about 111.2103524082.

It can be divided in two parts, 1375 and 421, that multiplied together give a palindrome (578875).

The spelling of 1375421 in words is "one million, three hundred seventy-five thousand, four hundred twenty-one".