1427297391 has 24 divisors (see below), whose sum is σ = 2223874016. Its totient is φ = 876899520.

The previous prime is 1427297383. The next prime is 1427297411. The reversal of 1427297391 is 1937927241.

It is not a de Polignac number, because 1427297391 - 2³ = 1427297383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1427297341) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64161 + ... + 83493.

Almost surely, 2^1427297391 is an apocalyptic number.

1427297391 is a deficient number, since it is larger than the sum of its proper divisors (796576625).

1427297391 is a wasteful number, since it uses less digits than its factorization.

1427297391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19983 (or 19980 counting only the distinct ones).

The product of its digits is 190512, while the sum is 45.

The square root of 1427297391 is about 37779.5896086763. The cubic root of 1427297391 is about 1125.9129750380.

The spelling of 1427297391 in words is "one billion, four hundred twenty-seven million, two hundred ninety-seven thousand, three hundred ninety-one".