1555897 has 12 divisors (see below), whose sum is σ = 1832436. Its totient is φ = 1317120.

The previous prime is 1555861. The next prime is 1555901. The reversal of 1555897 is 7985551.

It can be written as a sum of positive squares in 2 ways, for example, as 423801 + 1132096 = 651^2 + 1064^2 .

It is not a de Polignac number, because 1555897 - 2¹⁹ = 1031609 is a prime.

It is a Duffinian number.

1555897 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1555817) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5397 + ... + 5677.

It is an arithmetic number, because the mean of its divisors is an integer number (152703).

2^1555897 is an apocalyptic number.

It is an amenable number.

1555897 is a deficient number, since it is larger than the sum of its proper divisors (276539).

1555897 is a wasteful number, since it uses less digits than its factorization.

1555897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408 (or 401 counting only the distinct ones).

The product of its digits is 63000, while the sum is 40.

The square root of 1555897 is about 1247.3560037135. The cubic root of 1555897 is about 115.8760318521.

The spelling of 1555897 in words is "one million, five hundred fifty-five thousand, eight hundred ninety-seven".