1427403961 has 3 divisors (see below), whose sum is σ = 1427441743. Its totient is φ = 1427366180.

The previous prime is 1427403931. The next prime is 1427403977. The reversal of 1427403961 is 1693047241.

The square root of 1427403961 is 37781.

It is a perfect power (a square), and thus also a powerful 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, and also an emirpimes, since its reverse is a distinct semiprime: 1693047241 = 3259 ⋅519499.

It can be written as a sum of positive squares in only one way, i.e., 1184667561 + 242736400 = 34419^2 + 15580^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1427403961 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1427403961.

It is not an unprimeable number, because it can be changed into a prime (1427403931) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 18891 + ... + 56671.

Almost surely, 2^1427403961 is an apocalyptic number.

1427403961 is the 37781-st square number.

1427403961 is the 18891-st centered octagonal number.

It is an amenable number.

1427403961 is a deficient number, since it is larger than the sum of its proper divisors (37782).

1427403961 is an frugal number, since it uses more digits than its factorization.

1427403961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75562 (or 37781 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 37.

The cubic root of 1427403961 is about 1125.9409966590.

The spelling of 1427403961 in words is "one billion, four hundred twenty-seven million, four hundred three thousand, nine hundred sixty-one".