1550400 has 168 divisors, whose sum is σ = 5669280. Its totient is φ = 368640.

The previous prime is 1550387. The next prime is 1550401. The reversal of 1550400 is 40551.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1550400.

It is not an unprimeable number, because it can be changed into a prime (1550401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 81591 + ... + 81609.

2^1550400 is an apocalyptic number.

1550400 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 1550400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2834640).

1550400 is an abundant number, since it is smaller than the sum of its proper divisors (4118880).

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

1550400 is a wasteful number, since it uses less digits than its factorization.

1550400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61 (or 46 counting only the distinct ones).

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

The square root of 1550400 is about 1245.1505933019. The cubic root of 1550400 is about 115.7394070918.

Adding to 1550400 its reverse (40551), we get a palindrome (1590951).

The spelling of 1550400 in words is "one million, five hundred fifty thousand, four hundred".