1551389 has 8 divisors (see below), whose sum is σ = 1809600. Its totient is φ = 1329468.

The previous prime is 1551383. The next prime is 1551449. The reversal of 1551389 is 9831551.

It is not a de Polignac number, because 1551389 - 2⁸ = 1551133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1551383) 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, 1919 + ... + 2604.

It is an arithmetic number, because the mean of its divisors is an integer number (226200).

2^1551389 is an apocalyptic number.

It is an amenable number.

1551389 is a deficient number, since it is larger than the sum of its proper divisors (258211).

1551389 is an frugal number, since it uses more digits than its factorization.

1551389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4544 (or 4530 counting only the distinct ones).

The product of its digits is 5400, while the sum is 32.

The square root of 1551389 is about 1245.5476707055. The cubic root of 1551389 is about 115.7640119127.

The spelling of 1551389 in words is "one million, five hundred fifty-one thousand, three hundred eighty-nine".