1398745997 has 8 divisors (see below), whose sum is σ = 1526397600. Its totient is φ = 1271176560.

The previous prime is 1398745987. The next prime is 1398746017. The reversal of 1398745997 is 7995478931.

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

It is a cyclic number.

It is not a de Polignac number, because 1398745997 - 2¹⁰ = 1398744973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1398745927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18254 + ... + 55952.

It is an arithmetic number, because the mean of its divisors is an integer number (190799700).

Almost surely, 2^1398745997 is an apocalyptic number.

It is an amenable number.

1398745997 is a deficient number, since it is larger than the sum of its proper divisors (127651603).

1398745997 is a wasteful number, since it uses less digits than its factorization.

1398745997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41083.

The product of its digits is 17146080, while the sum is 62.

The square root of 1398745997 is about 37399.8127936491. The cubic root of 1398745997 is about 1118.3548329512.

The spelling of 1398745997 in words is "one billion, three hundred ninety-eight million, seven hundred forty-five thousand, nine hundred ninety-seven".