1340278731 has 40 divisors (see below), whose sum is σ = 2195424000. Its totient is φ = 808101360.

The previous prime is 1340278729. The next prime is 1340278733. The reversal of 1340278731 is 1378720431.

It is an interprime number because it is at equal distance from previous prime (1340278729) and next prime (1340278733).

It is not a de Polignac number, because 1340278731 - 2¹ = 1340278729 is a prime.

It is a super-2 number, since 2×1340278731² = 3592694153541940722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1340278733) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 173530 + ... + 181088.

It is an arithmetic number, because the mean of its divisors is an integer number (54885600).

Almost surely, 2^1340278731 is an apocalyptic number.

1340278731 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1340278731 is a deficient number, since it is larger than the sum of its proper divisors (855145269).

1340278731 is a wasteful number, since it uses less digits than its factorization.

1340278731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7781 (or 7772 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 1340278731 is about 36609.8174128197. The cubic root of 1340278731 is about 1102.5502073484.

The spelling of 1340278731 in words is "one billion, three hundred forty million, two hundred seventy-eight thousand, seven hundred thirty-one".