1340242402 has 4 divisors (see below), whose sum is σ = 2010363606. Its totient is φ = 670121200.

The previous prime is 1340242381. The next prime is 1340242403. The reversal of 1340242402 is 2042420431.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 849664201 + 490578201 = 29149^2 + 22149^2 .

It is a super-2 number, since 2×1340242402² = 3592499392237459208, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1340242403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335060599 + ... + 335060602.

Almost surely, 2^1340242402 is an apocalyptic number.

1340242402 is a deficient number, since it is larger than the sum of its proper divisors (670121204).

1340242402 is an equidigital number, since it uses as much as digits as its factorization.

1340242402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670121203.

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 1340242402 is about 36609.3212447322. The cubic root of 1340242402 is about 1102.5402455130.

Adding to 1340242402 its reverse (2042420431), we get a palindrome (3382662833).

The spelling of 1340242402 in words is "one billion, three hundred forty million, two hundred forty-two thousand, four hundred two".