7439945 has 4 divisors (see below), whose sum is σ = 8927940. Its totient is φ = 5951952.

The previous prime is 7439933. The next prime is 7439951. The reversal of 7439945 is 5499347.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1229881 + 6210064 = 1109^2 + 2492^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7439945 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 743990 + ... + 743999.

It is an arithmetic number, because the mean of its divisors is an integer number (2231985).

Almost surely, 2^7439945 is an apocalyptic number.

It is an amenable number.

7439945 is a deficient number, since it is larger than the sum of its proper divisors (1487995).

7439945 is a wasteful number, since it uses less digits than its factorization.

7439945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1487994.

The product of its digits is 136080, while the sum is 41.

The square root of 7439945 is about 2727.6262573894. The cubic root of 7439945 is about 195.2195204796.

The spelling of 7439945 in words is "seven million, four hundred thirty-nine thousand, nine hundred forty-five".