15420029 has 4 divisors (see below), whose sum is σ = 15443484. Its totient is φ = 15396576.

The previous prime is 15420017. The next prime is 15420043. The reversal of 15420029 is 92002451.

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 14822500 + 597529 = 3850^2 + 773^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15420029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15419986 and 15420013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15420049) 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, 10712 + ... + 12065.

It is an arithmetic number, because the mean of its divisors is an integer number (3860871).

Almost surely, 2^15420029 is an apocalyptic number.

It is an amenable number.

15420029 is a deficient number, since it is larger than the sum of its proper divisors (23455).

15420029 is an equidigital number, since it uses as much as digits as its factorization.

15420029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23454.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 15420029 is about 3926.8344757578. The cubic root of 15420029 is about 248.9020060302.

The spelling of 15420029 in words is "fifteen million, four hundred twenty thousand, twenty-nine".