1240400153 has 4 divisors (see below), whose sum is σ = 1240996020. Its totient is φ = 1239804288.

The previous prime is 1240400149. The next prime is 1240400167. The reversal of 1240400153 is 3510040421.

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

It can be written as a sum of positive squares in 2 ways, for example, as 715669504 + 524730649 = 26752^2 + 22907^2 .

It is a cyclic number.

It is not a de Polignac number, because 1240400153 - 2² = 1240400149 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1240400113) 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, 294800 + ... + 298977.

It is an arithmetic number, because the mean of its divisors is an integer number (310249005).

Almost surely, 2^1240400153 is an apocalyptic number.

It is an amenable number.

1240400153 is a deficient number, since it is larger than the sum of its proper divisors (595867).

1240400153 is an equidigital number, since it uses as much as digits as its factorization.

1240400153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 595866.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 1240400153 is about 35219.3150558043. The cubic root of 1240400153 is about 1074.4526228618.

Adding to 1240400153 its reverse (3510040421), we get a palindrome (4750440574).

The spelling of 1240400153 in words is "one billion, two hundred forty million, four hundred thousand, one hundred fifty-three".