1551366 has 16 divisors (see below), whose sum is σ = 3447600. Its totient is φ = 517104.

The previous prime is 1551343. The next prime is 1551371. The reversal of 1551366 is 6631551.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14311 + ... + 14418.

It is an arithmetic number, because the mean of its divisors is an integer number (215475).

2^1551366 is an apocalyptic number.

1551366 is an abundant number, since it is smaller than the sum of its proper divisors (1896234).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1551366 is a wasteful number, since it uses less digits than its factorization.

1551366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28740 (or 28734 counting only the distinct ones).

The product of its digits is 2700, while the sum is 27.

The square root of 1551366 is about 1245.5384377850. The cubic root of 1551366 is about 115.7634398263.

It can be divided in two parts, 155 and 1366, that added together give a square (1521 = 39²).

The spelling of 1551366 in words is "one million, five hundred fifty-one thousand, three hundred sixty-six".