1240245434 has 4 divisors (see below), whose sum is σ = 1860368154. Its totient is φ = 620122716.

The previous prime is 1240245403. The next prime is 1240245437. The reversal of 1240245434 is 4345420421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4345420421 = 2113 ⋅2056517.

It can be written as a sum of positive squares in only one way, i.e., 1016653225 + 223592209 = 31885^2 + 14953^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1240245397 and 1240245406.

It is not an unprimeable number, because it can be changed into a prime (1240245437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310061357 + ... + 310061360.

Almost surely, 2^1240245434 is an apocalyptic number.

1240245434 is a deficient number, since it is larger than the sum of its proper divisors (620122720).

1240245434 is an equidigital number, since it uses as much as digits as its factorization.

1240245434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620122719.

The product of its (nonzero) digits is 15360, while the sum is 29.

The square root of 1240245434 is about 35217.1184795122. The cubic root of 1240245434 is about 1074.4079477228.

Adding to 1240245434 its reverse (4345420421), we get a palindrome (5585665855).

The spelling of 1240245434 in words is "one billion, two hundred forty million, two hundred forty-five thousand, four hundred thirty-four".