1378694481 has 16 divisors (see below), whose sum is σ = 1953048000. Its totient is φ = 863448768.

The previous prime is 1378694479. The next prime is 1378694503. The reversal of 1378694481 is 1844968731.

It is not a de Polignac number, because 1378694481 - 2¹ = 1378694479 is a prime.

It is a super-2 number, since 2×1378694481² = 3801596943879718722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1378694081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 210931 + ... + 217368.

It is an arithmetic number, because the mean of its divisors is an integer number (122065500).

Almost surely, 2^1378694481 is an apocalyptic number.

It is an amenable number.

1378694481 is a deficient number, since it is larger than the sum of its proper divisors (574353519).

1378694481 is a wasteful number, since it uses less digits than its factorization.

1378694481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428368.

The product of its digits is 1161216, while the sum is 51.

The square root of 1378694481 is about 37130.7753891566. The cubic root of 1378694481 is about 1112.9850882227.

The spelling of 1378694481 in words is "one billion, three hundred seventy-eight million, six hundred ninety-four thousand, four hundred eighty-one".