1550040 has 32 divisors (see below), whose sum is σ = 4650480. Its totient is φ = 413312.

The previous prime is 1550033. The next prime is 1550051. The reversal of 1550040 is 400551.

It is a Harshad number since it is a multiple of its sum of digits (15).

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, 6339 + ... + 6578.

2^1550040 is an apocalyptic number.

1550040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1550040 is an abundant number, since it is smaller than the sum of its proper divisors (3100440).

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

1550040 is a wasteful number, since it uses less digits than its factorization.

1550040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12931 (or 12927 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 15.

The square root of 1550040 is about 1245.0060240818. The cubic root of 1550040 is about 115.7304482399.

Subtracting from 1550040 its sum of digits (15), we obtain a square (1550025 = 1245²).

Adding to 1550040 its reverse (400551), we get a palindrome (1950591).

The spelling of 1550040 in words is "one million, five hundred fifty thousand, forty".