1440400153 has 4 divisors (see below), whose sum is σ = 1446690340. Its totient is φ = 1434109968.

The previous prime is 1440400097. The next prime is 1440400163. The reversal of 1440400153 is 3510040441.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3510040441 = 31 ⋅113227111.

It can be written as a sum of positive squares in 2 ways, for example, as 983637769 + 456762384 = 31363^2 + 21372^2 .

It is a cyclic number.

It is not a de Polignac number, because 1440400153 - 2⁹ = 1440399641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1440400163) 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, 3144750 + ... + 3145207.

It is an arithmetic number, because the mean of its divisors is an integer number (361672585).

Almost surely, 2^1440400153 is an apocalyptic number.

It is an amenable number.

1440400153 is a deficient number, since it is larger than the sum of its proper divisors (6290187).

1440400153 is an equidigital number, since it uses as much as digits as its factorization.

1440400153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6290186.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 1440400153 is about 37952.6040345060. The cubic root of 1440400153 is about 1129.3478245227.

Adding to 1440400153 its reverse (3510040441), we get a palindrome (4950440594).

The spelling of 1440400153 in words is "one billion, four hundred forty million, four hundred thousand, one hundred fifty-three".