1378434731 has 2 divisors, whose sum is σ = 1378434732. Its totient is φ = 1378434730.

The previous prime is 1378434721. The next prime is 1378434773. The reversal of 1378434731 is 1374348731.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1378434731 - 2¹⁴ = 1378418347 is a prime.

It is a super-3 number, since 3×1378434731³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (1378434721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689217365 + 689217366.

It is an arithmetic number, because the mean of its divisors is an integer number (689217366).

Almost surely, 2^1378434731 is an apocalyptic number.

1378434731 is a deficient number, since it is larger than the sum of its proper divisors (1).

1378434731 is an equidigital number, since it uses as much as digits as its factorization.

1378434731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 169344, while the sum is 41.

The square root of 1378434731 is about 37127.2774520298. The cubic root of 1378434731 is about 1112.9151873036.

The spelling of 1378434731 in words is "one billion, three hundred seventy-eight million, four hundred thirty-four thousand, seven hundred thirty-one".