1397427761 has 16 divisors (see below), whose sum is σ = 1506988800. Its totient is φ = 1291100928.

The previous prime is 1397427749. The next prime is 1397427781. The reversal of 1397427761 is 1677247931.

It is a cyclic number.

It is not a de Polignac number, because 1397427761 - 2¹⁸ = 1397165617 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1397427781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 237491 + ... + 243303.

It is an arithmetic number, because the mean of its divisors is an integer number (94186800).

Almost surely, 2^1397427761 is an apocalyptic number.

It is an amenable number.

1397427761 is a deficient number, since it is larger than the sum of its proper divisors (109561039).

1397427761 is a wasteful number, since it uses less digits than its factorization.

1397427761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6088.

The product of its digits is 444528, while the sum is 47.

The square root of 1397427761 is about 37382.1850752467. The cubic root of 1397427761 is about 1118.0033945961.

The spelling of 1397427761 in words is "one billion, three hundred ninety-seven million, four hundred twenty-seven thousand, seven hundred sixty-one".