1408689191 has 18 divisors (see below), whose sum is σ = 1774438272. Its totient is φ = 1114560720.

The previous prime is 1408689187. The next prime is 1408689223. The reversal of 1408689191 is 1919868041.

It is not a de Polignac number, because 1408689191 - 2² = 1408689187 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 (1408689131) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 76775 + ... + 93336.

It is an arithmetic number, because the mean of its divisors is an integer number (98579904).

Almost surely, 2^1408689191 is an apocalyptic number.

1408689191 is a deficient number, since it is larger than the sum of its proper divisors (365749081).

1408689191 is a wasteful number, since it uses less digits than its factorization.

1408689191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170151 (or 170131 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 47.

The square root of 1408689191 is about 37532.5084560038. The cubic root of 1408689191 is about 1120.9985755659.

The spelling of 1408689191 in words is "one billion, four hundred eight million, six hundred eighty-nine thousand, one hundred ninety-one".