7428749 has 16 divisors (see below), whose sum is σ = 8043840. Its totient is φ = 6848640.

The previous prime is 7428737. The next prime is 7428761. The reversal of 7428749 is 9478247.

It is an interprime number because it is at equal distance from previous prime (7428737) and next prime (7428761).

It is a de Polignac number, because none of the positive numbers 2^k-7428749 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7428049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89462 + ... + 89544.

It is an arithmetic number, because the mean of its divisors is an integer number (502740).

Almost surely, 2^7428749 is an apocalyptic number.

It is an amenable number.

7428749 is a deficient number, since it is larger than the sum of its proper divisors (615091).

7428749 is a wasteful number, since it uses less digits than its factorization.

7428749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220.

The product of its digits is 112896, while the sum is 41.

The square root of 7428749 is about 2725.5731507336. The cubic root of 7428749 is about 195.1215459632.

It can be divided in two parts, 742874 and 9, that multiplied together give a palindrome (6685866).

The spelling of 7428749 in words is "seven million, four hundred twenty-eight thousand, seven hundred forty-nine".