1427997791 has 8 divisors (see below), whose sum is σ = 1575320400. Its totient is φ = 1283592640.

The previous prime is 1427997751. The next prime is 1427997799. The reversal of 1427997791 is 1977997241.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1427997791 is a prime.

It is a super-2 number, since 2×1427997791² = 4078355382201759362, 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 (1427997799) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 728336 + ... + 730293.

It is an arithmetic number, because the mean of its divisors is an integer number (196915050).

Almost surely, 2^1427997791 is an apocalyptic number.

1427997791 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1427997791 is a deficient number, since it is larger than the sum of its proper divisors (147322609).

1427997791 is a wasteful number, since it uses less digits than its factorization.

1427997791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1458729.

The product of its digits is 2000376, while the sum is 56.

The square root of 1427997791 is about 37788.8580272016. The cubic root of 1427997791 is about 1126.0971133721.

The spelling of 1427997791 in words is "one billion, four hundred twenty-seven million, nine hundred ninety-seven thousand, seven hundred ninety-one".