1397943651 has 8 divisors (see below), whose sum is σ = 2007303760. Its totient is φ = 860272992.

The previous prime is 1397943629. The next prime is 1397943661. The reversal of 1397943651 is 1563497931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1397943651 - 2⁵ = 1397943619 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 1397943651.

It is not an unprimeable number, because it can be changed into a prime (1397943661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17922316 + ... + 17922393.

It is an arithmetic number, because the mean of its divisors is an integer number (250912970).

Almost surely, 2^1397943651 is an apocalyptic number.

1397943651 is a deficient number, since it is larger than the sum of its proper divisors (609360109).

1397943651 is a wasteful number, since it uses less digits than its factorization.

1397943651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35844725.

The product of its digits is 612360, while the sum is 48.

The square root of 1397943651 is about 37389.0846504698. The cubic root of 1397943651 is about 1118.1409558656.

It can be divided in two parts, 13979 and 43651, that added together give a triangular number (57630 = T₃₃₉).

The spelling of 1397943651 in words is "one billion, three hundred ninety-seven million, nine hundred forty-three thousand, six hundred fifty-one".