7289991 has 48 divisors (see below), whose sum is σ = 12130560. Its totient is φ = 4193280.

The previous prime is 7289987. The next prime is 7289993. The reversal of 7289991 is 1999827.

7289991 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 7289991 - 2² = 7289987 is a prime.

It is a super-3 number, since 3×7289991³ (a number of 22 digits) contains 333 as substring.

7289991 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7289993) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 137521 + ... + 137573.

It is an arithmetic number, because the mean of its divisors is an integer number (252720).

Almost surely, 2^7289991 is an apocalyptic number.

7289991 is a deficient number, since it is larger than the sum of its proper divisors (4840569).

7289991 is a wasteful number, since it uses less digits than its factorization.

7289991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136 (or 133 counting only the distinct ones).

The product of its digits is 81648, while the sum is 45.

The square root of 7289991 is about 2699.9983333328. The cubic root of 7289991 is about 193.8990423090.

It can be divided in two parts, 728999 and 1, that added together give a cube (729000 = 90³).

The spelling of 7289991 in words is "seven million, two hundred eighty-nine thousand, nine hundred ninety-one".