1630400755 has 4 divisors (see below), whose sum is σ = 1956480912. Its totient is φ = 1304320600.

The previous prime is 1630400753. The next prime is 1630400767. The reversal of 1630400755 is 5570040361.

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

It is not a de Polignac number, because 1630400755 - 2¹ = 1630400753 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1630400753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163040071 + ... + 163040080.

It is an arithmetic number, because the mean of its divisors is an integer number (489120228).

Almost surely, 2^1630400755 is an apocalyptic number.

1630400755 is a deficient number, since it is larger than the sum of its proper divisors (326080157).

1630400755 is an equidigital number, since it uses as much as digits as its factorization.

1630400755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326080156.

The product of its (nonzero) digits is 12600, while the sum is 31.

The square root of 1630400755 is about 40378.2212956440. The cubic root of 1630400755 is about 1176.9683633433.

The spelling of 1630400755 in words is "one billion, six hundred thirty million, four hundred thousand, seven hundred fifty-five".