1553440043 has 4 divisors (see below), whose sum is σ = 1553620440. Its totient is φ = 1553259648.

The previous prime is 1553440037. The next prime is 1553440061. The reversal of 1553440043 is 3400443551.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1553440043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1553439988 and 1553440015.

It is not an unprimeable number, because it can be changed into a prime (1553440243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76598 + ... + 94731.

It is an arithmetic number, because the mean of its divisors is an integer number (388405110).

Almost surely, 2^1553440043 is an apocalyptic number.

1553440043 is a deficient number, since it is larger than the sum of its proper divisors (180397).

1553440043 is an equidigital number, since it uses as much as digits as its factorization.

1553440043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180396.

The product of its (nonzero) digits is 14400, while the sum is 29.

The square root of 1553440043 is about 39413.7037462860. The cubic root of 1553440043 is about 1158.1500544322.

Adding to 1553440043 its reverse (3400443551), we get a palindrome (4953883594).

The spelling of 1553440043 in words is "one billion, five hundred fifty-three million, four hundred forty thousand, forty-three".