1555983 has 48 divisors (see below), whose sum is σ = 2810880. Its totient is φ = 842400.

The previous prime is 1555969. The next prime is 1555997. The reversal of 1555983 is 3895551.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1555969) and next prime (1555997).

It is not a de Polignac number, because 1555983 - 2⁵ = 1555951 is a prime.

It is an Ulam number.

1555983 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1555913) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 50178 + ... + 50208.

It is an arithmetic number, because the mean of its divisors is an integer number (58560).

2^1555983 is an apocalyptic number.

1555983 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1555983 is a deficient number, since it is larger than the sum of its proper divisors (1254897).

1555983 is a wasteful number, since it uses less digits than its factorization.

1555983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77 (or 58 counting only the distinct ones).

The product of its digits is 27000, while the sum is 36.

The square root of 1555983 is about 1247.3904761541. The cubic root of 1555983 is about 115.8781667739.

The spelling of 1555983 in words is "one million, five hundred fifty-five thousand, nine hundred eighty-three".