1553421400 has 24 divisors (see below), whose sum is σ = 3611705220. Its totient is φ = 621368480.

The previous prime is 1553421391. The next prime is 1553421413. The reversal of 1553421400 is 41243551.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3883354 + ... + 3883753.

Almost surely, 2^1553421400 is an apocalyptic number.

1553421400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1553421400 is an abundant number, since it is smaller than the sum of its proper divisors (2058283820).

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

1553421400 is a wasteful number, since it uses less digits than its factorization.

1553421400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7767123 (or 7767114 counting only the distinct ones).

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

The square root of 1553421400 is about 39413.4672415407. The cubic root of 1553421400 is about 1158.1454213861.

Adding to 1553421400 its reverse (41243551), we get a palindrome (1594664951).

The spelling of 1553421400 in words is "one billion, five hundred fifty-three million, four hundred twenty-one thousand, four hundred".