1539649 has 2 divisors, whose sum is σ = 1539650. Its totient is φ = 1539648.

The previous prime is 1539641. The next prime is 1539653. The reversal of 1539649 is 9469351.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1404225 + 135424 = 1185^2 + 368^2 .

It is a cyclic number.

It is not a de Polignac number, because 1539649 - 2³ = 1539641 is a prime.

1539649 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1539641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 769824 + 769825.

It is an arithmetic number, because the mean of its divisors is an integer number (769825).

2^1539649 is an apocalyptic number.

It is an amenable number.

1539649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1539649 is an equidigital number, since it uses as much as digits as its factorization.

1539649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29160, while the sum is 37.

The square root of 1539649 is about 1240.8259346097. The cubic root of 1539649 is about 115.4712608793.

The spelling of 1539649 in words is "one million, five hundred thirty-nine thousand, six hundred forty-nine".