1553021340 has 192 divisors, whose sum is σ = 4917749760. Its totient is φ = 363525120.

The previous prime is 1553021333. The next prime is 1553021413. The reversal of 1553021340 is 431203551.

It is a self number, because there is not a number n which added to its sum of digits gives 1553021340.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1605537 + ... + 1606503.

It is an arithmetic number, because the mean of its divisors is an integer number (25613280).

Almost surely, 2^1553021340 is an apocalyptic number.

1553021340 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 1553021340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2458874880).

1553021340 is an abundant number, since it is smaller than the sum of its proper divisors (3364728420).

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

1553021340 is a wasteful number, since it uses less digits than its factorization.

1553021340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1092 (or 1090 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 1553021340 is about 39408.3917459213. The cubic root of 1553021340 is about 1158.0459919509.

Adding to 1553021340 its reverse (431203551), we get a palindrome (1984224891).

The spelling of 1553021340 in words is "one billion, five hundred fifty-three million, twenty-one thousand, three hundred forty".