1551040 has 56 divisors (see below), whose sum is σ = 3822192. Its totient is φ = 599040.

The previous prime is 1551037. The next prime is 1551041. The reversal of 1551040 is 401551.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1551041) 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, 11775 + ... + 11905.

2^1551040 is an apocalyptic number.

1551040 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 1551040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1911096).

1551040 is an abundant number, since it is smaller than the sum of its proper divisors (2271152).

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

1551040 is a wasteful number, since it uses less digits than its factorization.

1551040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185 (or 175 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 1551040 is about 1245.4075638119. The cubic root of 1551040 is about 115.7553305160.

Adding to 1551040 its reverse (401551), we get a palindrome (1952591).

The spelling of 1551040 in words is "one million, five hundred fifty-one thousand, forty".