731290389 has 8 divisors (see below), whose sum is σ = 975226560. Its totient is φ = 487440576.

The previous prime is 731290369. The next prime is 731290393. The reversal of 731290389 is 983092137.

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

It is not a de Polignac number, because 731290389 - 2⁹ = 731289877 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 731290389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (731290319) 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, 1789 + ... + 38285.

It is an arithmetic number, because the mean of its divisors is an integer number (121903320).

Almost surely, 2^731290389 is an apocalyptic number.

It is an amenable number.

731290389 is a deficient number, since it is larger than the sum of its proper divisors (243936171).

731290389 is a wasteful number, since it uses less digits than its factorization.

731290389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43179.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 731290389 is about 27042.3813485425. The cubic root of 731290389 is about 900.9415615277.

The spelling of 731290389 in words is "seven hundred thirty-one million, two hundred ninety thousand, three hundred eighty-nine".