1378914557 has 16 divisors (see below), whose sum is σ = 1501516800. Its totient is φ = 1261018368.

The previous prime is 1378914541. The next prime is 1378914571. The reversal of 1378914557 is 7554198731.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1378914557 - 2⁴ = 1378914541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1378917557) 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, 879188 + ... + 880754.

It is an arithmetic number, because the mean of its divisors is an integer number (93844800).

Almost surely, 2^1378914557 is an apocalyptic number.

1378914557 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1378914557 is a deficient number, since it is larger than the sum of its proper divisors (122602243).

1378914557 is a wasteful number, since it uses less digits than its factorization.

1378914557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3020.

The product of its digits is 1058400, while the sum is 50.

The square root of 1378914557 is about 37133.7387964099. The cubic root of 1378914557 is about 1113.0443056630.

The spelling of 1378914557 in words is "one billion, three hundred seventy-eight million, nine hundred fourteen thousand, five hundred fifty-seven".