7420731 has 8 divisors (see below), whose sum is σ = 10005840. Its totient is φ = 4891392.

The previous prime is 7420729. The next prime is 7420733. The reversal of 7420731 is 1370247.

It is an interprime number because it is at equal distance from previous prime (7420729) and next prime (7420733).

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

It is not a de Polignac number, because 7420731 - 2¹ = 7420729 is a prime.

It is a super-2 number, since 2×7420731² = 110134497148722, which contains 22 as substring.

7420731 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7420733) 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, 13630 + ... + 14163.

It is an arithmetic number, because the mean of its divisors is an integer number (1250730).

Almost surely, 2^7420731 is an apocalyptic number.

7420731 is a deficient number, since it is larger than the sum of its proper divisors (2585109).

7420731 is a wasteful number, since it uses less digits than its factorization.

7420731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27885.

The product of its (nonzero) digits is 1176, while the sum is 24.

The square root of 7420731 is about 2724.1018703419. The cubic root of 7420731 is about 195.0513211401.

Adding to 7420731 its reverse (1370247), we get a palindrome (8790978).

The spelling of 7420731 in words is "seven million, four hundred twenty thousand, seven hundred thirty-one".