1893139457 has 16 divisors (see below), whose sum is σ = 2115685440. Its totient is φ = 1679092800.

The previous prime is 1893139439. The next prime is 1893139463. The reversal of 1893139457 is 7549313981.

It is not a de Polignac number, because 1893139457 - 2⁶ = 1893139393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1893139477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 556919 + ... + 560307.

It is an arithmetic number, because the mean of its divisors is an integer number (132230340).

Almost surely, 2^1893139457 is an apocalyptic number.

It is an amenable number.

1893139457 is a deficient number, since it is larger than the sum of its proper divisors (222545983).

1893139457 is a wasteful number, since it uses less digits than its factorization.

1893139457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4624.

The product of its digits is 816480, while the sum is 50.

The square root of 1893139457 is about 43510.2224425479. Note that the first 3 decimals coincide. The cubic root of 1893139457 is about 1237.0697931455.

The spelling of 1893139457 in words is "one billion, eight hundred ninety-three million, one hundred thirty-nine thousand, four hundred fifty-seven".