1555400441 has 8 divisors (see below), whose sum is σ = 1778375424. Its totient is φ = 1332619200.

The previous prime is 1555400437. The next prime is 1555400443. The reversal of 1555400441 is 1440045551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1555400441 - 2² = 1555400437 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1555400443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30800 + ... + 63713.

It is an arithmetic number, because the mean of its divisors is an integer number (222296928).

Almost surely, 2^1555400441 is an apocalyptic number.

It is an amenable number.

1555400441 is a deficient number, since it is larger than the sum of its proper divisors (222974983).

1555400441 is an equidigital number, since it uses as much as digits as its factorization.

1555400441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96871.

The product of its (nonzero) digits is 8000, while the sum is 29.

The square root of 1555400441 is about 39438.5654024078. The cubic root of 1555400441 is about 1158.6370339918.

Adding to 1555400441 its reverse (1440045551), we get a palindrome (2995445992).

The spelling of 1555400441 in words is "one billion, five hundred fifty-five million, four hundred thousand, four hundred forty-one".