1551998 has 16 divisors (see below), whose sum is σ = 2817504. Its totient is φ = 625920.

The previous prime is 1551997. The next prime is 1552007. The reversal of 1551998 is 8991551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1551997) 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, 3023 + ... + 3498.

It is an arithmetic number, because the mean of its divisors is an integer number (176094).

2^1551998 is an apocalyptic number.

1551998 is a deficient number, since it is larger than the sum of its proper divisors (1265506).

1551998 is a wasteful number, since it uses less digits than its factorization.

1551998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6547.

The product of its digits is 16200, while the sum is 38.

The square root of 1551998 is about 1245.7921174899. The cubic root of 1551998 is about 115.7791577079.

The spelling of 1551998 in words is "one million, five hundred fifty-one thousand, nine hundred ninety-eight".