1555642 has 16 divisors (see below), whose sum is σ = 2628864. Its totient is φ = 684000.

The previous prime is 1555639. The next prime is 1555643. The reversal of 1555642 is 2465551.

It is a self number, because there is not a number n which added to its sum of digits gives 1555642.

It is not an unprimeable number, because it can be changed into a prime (1555643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 459 + ... + 1822.

It is an arithmetic number, because the mean of its divisors is an integer number (164304).

2^1555642 is an apocalyptic number.

1555642 is a deficient number, since it is larger than the sum of its proper divisors (1073222).

1555642 is a wasteful number, since it uses less digits than its factorization.

1555642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2325.

The product of its digits is 6000, while the sum is 28.

The square root of 1555642 is about 1247.2537833176. The cubic root of 1555642 is about 115.8697010983.

Subtracting 1555642 from its reverse (2465551), we obtain a palindrome (909909).

It can be divided in two parts, 1555 and 642, that added together give a cube (2197 = 13³).

The spelling of 1555642 in words is "one million, five hundred fifty-five thousand, six hundred forty-two".