1340039402 has 8 divisors (see below), whose sum is σ = 2164679076. Its totient is φ = 618479712.

The previous prime is 1340039341. The next prime is 1340039411. The reversal of 1340039402 is 2049300431.

It can be written as a sum of positive squares in 2 ways, for example, as 1291611721 + 48427681 = 35939^2 + 6959^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (26), and also a Moran number because the ratio is a prime number: 51539977 = 1340039402 / (1 + 3 + 4 + 0 + 0 + 3 + 9 + 4 + 0 + 2).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25769963 + ... + 25770014.

Almost surely, 2^1340039402 is an apocalyptic number.

1340039402 is a deficient number, since it is larger than the sum of its proper divisors (824639674).

1340039402 is a wasteful number, since it uses less digits than its factorization.

1340039402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51539992.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 1340039402 is about 36606.5486217972. The cubic root of 1340039402 is about 1102.4845772323.

Adding to 1340039402 its reverse (2049300431), we get a palindrome (3389339833).

The spelling of 1340039402 in words is "one billion, three hundred forty million, thirty-nine thousand, four hundred two".