1398759961 has 8 divisors (see below), whose sum is σ = 1421198784. Its totient is φ = 1376494800.

The previous prime is 1398759953. The next prime is 1398759979. The reversal of 1398759961 is 1699578931.

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 1398759961 - 2³ = 1398759953 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1398759896 and 1398759905.

It is not an unprimeable number, because it can be changed into a prime (1398759931) 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, 27130 + ... + 59443.

It is an arithmetic number, because the mean of its divisors is an integer number (177649848).

Almost surely, 2^1398759961 is an apocalyptic number.

It is an amenable number.

1398759961 is a deficient number, since it is larger than the sum of its proper divisors (22438823).

1398759961 is a wasteful number, since it uses less digits than its factorization.

1398759961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86831.

The product of its digits is 3674160, while the sum is 58.

The square root of 1398759961 is about 37399.9994786096. Note that the first 3 decimals coincide. The cubic root of 1398759961 is about 1118.3585545359.

The spelling of 1398759961 in words is "one billion, three hundred ninety-eight million, seven hundred fifty-nine thousand, nine hundred sixty-one".