1284720431 has 4 divisors (see below), whose sum is σ = 1296727272. Its totient is φ = 1272713592.

The previous prime is 1284720373. The next prime is 1284720433. The reversal of 1284720431 is 1340274821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1340274821 = 349 ⋅3840329.

It is a cyclic number.

It is not a de Polignac number, because 1284720431 - 2¹⁰ = 1284719407 is a prime.

It is a super-2 number, since 2×1284720431² = 3301013171657651522, 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 (1284720433) 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, 6003260 + ... + 6003473.

It is an arithmetic number, because the mean of its divisors is an integer number (324181818).

Almost surely, 2^1284720431 is an apocalyptic number.

1284720431 is a deficient number, since it is larger than the sum of its proper divisors (12006841).

1284720431 is a wasteful number, since it uses less digits than its factorization.

1284720431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12006840.

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 1284720431 is about 35842.9969589598. The cubic root of 1284720431 is about 1087.1001197873.

The spelling of 1284720431 in words is "one billion, two hundred eighty-four million, seven hundred twenty thousand, four hundred thirty-one".