7981429 has 8 divisors (see below), whose sum is σ = 8332632. Its totient is φ = 7637760.

The previous prime is 7981417. The next prime is 7981433. The reversal of 7981429 is 9241897.

It can be written as a sum of positive squares in 4 ways, for example, as 12100 + 7969329 = 110^2 + 2823^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 7981429 - 2⁵ = 7981397 is a prime.

It is a Duffinian number.

7981429 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 7981391 and 7981400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7984429) 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, 337 + ... + 4009.

It is an arithmetic number, because the mean of its divisors is an integer number (1041579).

Almost surely, 2^7981429 is an apocalyptic number.

It is an amenable number.

7981429 is a deficient number, since it is larger than the sum of its proper divisors (351203).

7981429 is a wasteful number, since it uses less digits than its factorization.

7981429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3767.

The product of its digits is 36288, while the sum is 40.

The square root of 7981429 is about 2825.1422973011. The cubic root of 7981429 is about 199.8451217613.

The spelling of 7981429 in words is "seven million, nine hundred eighty-one thousand, four hundred twenty-nine".