1057938391 has 4 divisors (see below), whose sum is σ = 1058047384. Its totient is φ = 1057829400.

The previous prime is 1057938361. The next prime is 1057938403. The reversal of 1057938391 is 1938397501.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1057938391 - 2¹⁵ = 1057905623 is a prime.

It is a super-2 number, since 2×1057938391² = 2238467278303337762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1057938361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38340 + ... + 59881.

It is an arithmetic number, because the mean of its divisors is an integer number (264511846).

Almost surely, 2^1057938391 is an apocalyptic number.

1057938391 is a deficient number, since it is larger than the sum of its proper divisors (108993).

1057938391 is an equidigital number, since it uses as much as digits as its factorization.

1057938391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108992.

The product of its (nonzero) digits is 204120, while the sum is 46.

The square root of 1057938391 is about 32525.9648742355. The cubic root of 1057938391 is about 1018.9513736140.

The spelling of 1057938391 in words is "one billion, fifty-seven million, nine hundred thirty-eight thousand, three hundred ninety-one".