1975409 has 2 divisors, whose sum is σ = 1975410. Its totient is φ = 1975408.

The previous prime is 1975399. The next prime is 1975423. The reversal of 1975409 is 9045791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1882384 + 93025 = 1372^2 + 305^2 .

It is a cyclic number.

It is not a de Polignac number, because 1975409 - 2⁸ = 1975153 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1975439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 987704 + 987705.

It is an arithmetic number, because the mean of its divisors is an integer number (987705).

2^1975409 is an apocalyptic number.

It is an amenable number.

1975409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1975409 is an equidigital number, since it uses as much as digits as its factorization.

1975409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 1975409 is about 1405.4924403923. The cubic root of 1975409 is about 125.4735953931.

The spelling of 1975409 in words is "one million, nine hundred seventy-five thousand, four hundred nine".