1553421408 has 192 divisors, whose sum is σ = 5248696320. Its totient is φ = 390412800.

The previous prime is 1553421391. The next prime is 1553421413. The reversal of 1553421408 is 8041243551.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 225763 + ... + 232541.

It is an arithmetic number, because the mean of its divisors is an integer number (27336960).

Almost surely, 2^1553421408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1553421408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2624348160).

1553421408 is an abundant number, since it is smaller than the sum of its proper divisors (3695274912).

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

1553421408 is a wasteful number, since it uses less digits than its factorization.

1553421408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6841 (or 6833 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 33.

The square root of 1553421408 is about 39413.4673430288. The cubic root of 1553421408 is about 1158.1454233743.

Adding to 1553421408 its reverse (8041243551), we get a palindrome (9594664959).

The spelling of 1553421408 in words is "one billion, five hundred fifty-three million, four hundred twenty-one thousand, four hundred eight".