1375739 has 2 divisors, whose sum is σ = 1375740. Its totient is φ = 1375738.

The previous prime is 1375729. The next prime is 1375747. The reversal of 1375739 is 9375731.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1375739 - 2⁴ = 1375723 is a prime.

It is a super-3 number, since 3×1375739³ = 7811409431333125257, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1375699 and 1375708.

It is not a weakly prime, because it can be changed into another prime (1375709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 687869 + 687870.

It is an arithmetic number, because the mean of its divisors is an integer number (687870).

2^1375739 is an apocalyptic number.

1375739 is a deficient number, since it is larger than the sum of its proper divisors (1).

1375739 is an equidigital number, since it uses as much as digits as its factorization.

1375739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19845, while the sum is 35.

The square root of 1375739 is about 1172.9190082866. The cubic root of 1375739 is about 111.2189224307.

The spelling of 1375739 in words is "one million, three hundred seventy-five thousand, seven hundred thirty-nine".