7389991 has 4 divisors (see below), whose sum is σ = 8445712. Its totient is φ = 6334272.

The previous prime is 7389989. The next prime is 7390007. The reversal of 7389991 is 1999837.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 7389991 - 2¹ = 7389989 is a prime.

It is a super-2 number, since 2×7389991² = 109223933960162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7389901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 527850 + ... + 527863.

It is an arithmetic number, because the mean of its divisors is an integer number (2111428).

Almost surely, 2^7389991 is an apocalyptic number.

7389991 is the 1570-th hex number.

7389991 is a deficient number, since it is larger than the sum of its proper divisors (1055721).

7389991 is a wasteful number, since it uses less digits than its factorization.

7389991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1055720.

The product of its digits is 122472, while the sum is 46.

The square root of 7389991 is about 2718.4537884614. The cubic root of 7389991 is about 194.7816183339.

The spelling of 7389991 in words is "seven million, three hundred eighty-nine thousand, nine hundred ninety-one".