1551423400 has 96 divisors (see below), whose sum is σ = 3841863480. Its totient is φ = 580608000.

The previous prime is 1551423323. The next prime is 1551423407. The reversal of 1551423400 is 43241551.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 153710404 + 1397712996 = 12398^2 + 37386^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (1551423407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 614140 + ... + 616660.

Almost surely, 2^1551423400 is an apocalyptic number.

1551423400 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 1551423400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1920931740).

1551423400 is an abundant number, since it is smaller than the sum of its proper divisors (2290440080).

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

1551423400 is a wasteful number, since it uses less digits than its factorization.

1551423400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2735 (or 2726 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 1551423400 is about 39388.1124198660. The cubic root of 1551423400 is about 1157.6486754432.

Adding to 1551423400 its reverse (43241551), we get a palindrome (1594664951).

The spelling of 1551423400 in words is "one billion, five hundred fifty-one million, four hundred twenty-three thousand, four hundred".