1553232402 has 64 divisors (see below), whose sum is σ = 3577824000. Its totient is φ = 498887424.

The previous prime is 1553232383. The next prime is 1553232403. The reversal of 1553232402 is 2042323551.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1553232403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1538874 + ... + 1539882.

It is an arithmetic number, because the mean of its divisors is an integer number (55903500).

Almost surely, 2^1553232402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1553232402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1788912000).

1553232402 is an abundant number, since it is smaller than the sum of its proper divisors (2024591598).

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

1553232402 is a wasteful number, since it uses less digits than its factorization.

1553232402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2032 (or 2026 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 1553232402 is about 39411.0695363625. The cubic root of 1553232402 is about 1158.0984506487.

Adding to 1553232402 its reverse (2042323551), we get a palindrome (3595555953).

The spelling of 1553232402 in words is "one billion, five hundred fifty-three million, two hundred thirty-two thousand, four hundred two".