1551340 has 36 divisors (see below), whose sum is σ = 3792096. Its totient is φ = 531552.

The previous prime is 1551289. The next prime is 1551343. The reversal of 1551340 is 431551.

It is not an unprimeable number, because it can be changed into a prime (1551343) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 189 + ... + 1771.

It is an arithmetic number, because the mean of its divisors is an integer number (105336).

2^1551340 is an apocalyptic number.

1551340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1551340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1896048).

1551340 is an abundant number, since it is smaller than the sum of its proper divisors (2240756).

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

1551340 is a wasteful number, since it uses less digits than its factorization.

1551340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1606 (or 1597 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 1551340 is about 1245.5280004881. The cubic root of 1551340 is about 115.7627931132.

Adding to 1551340 its reverse (431551), we get a palindrome (1982891).

It can be divided in two parts, 1551 and 340, that added together give a triangular number (1891 = T₆₁).

The spelling of 1551340 in words is "one million, five hundred fifty-one thousand, three hundred forty".