1397707761 has 16 divisors (see below), whose sum is σ = 1916064000. Its totient is φ = 905845248.

The previous prime is 1397707721. The next prime is 1397707783. The reversal of 1397707761 is 1677077931.

It is not a de Polignac number, because 1397707761 - 2¹⁴ = 1397691377 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1397707761.

It is not an unprimeable number, because it can be changed into a prime (1397707721) 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, 12256 + ... + 54273.

It is an arithmetic number, because the mean of its divisors is an integer number (119754000).

Almost surely, 2^1397707761 is an apocalyptic number.

It is an amenable number.

1397707761 is a deficient number, since it is larger than the sum of its proper divisors (518356239).

1397707761 is a wasteful number, since it uses less digits than its factorization.

1397707761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66728.

The product of its (nonzero) digits is 388962, while the sum is 48.

The square root of 1397707761 is about 37385.9299870954. The cubic root of 1397707761 is about 1118.0780603627.

The spelling of 1397707761 in words is "one billion, three hundred ninety-seven million, seven hundred seven thousand, seven hundred sixty-one".