7407997 has 4 divisors (see below), whose sum is σ = 7580320. Its totient is φ = 7235676.

The previous prime is 7407979. The next prime is 7408007. The reversal of 7407997 is 7997047.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7407997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 172279 = 7407997 / (7 + 4 + 0 + 7 + 9 + 9 + 7).

It is a Duffinian number.

7407997 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7407097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86097 + ... + 86182.

It is an arithmetic number, because the mean of its divisors is an integer number (1895080).

Almost surely, 2^7407997 is an apocalyptic number.

It is an amenable number.

7407997 is a deficient number, since it is larger than the sum of its proper divisors (172323).

7407997 is a wasteful number, since it uses less digits than its factorization.

7407997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172322.

The product of its (nonzero) digits is 111132, while the sum is 43.

The square root of 7407997 is about 2721.7635826794. The cubic root of 7407997 is about 194.9396876812.

The spelling of 7407997 in words is "seven million, four hundred seven thousand, nine hundred ninety-seven".