15420047 has 2 divisors, whose sum is σ = 15420048. Its totient is φ = 15420046.

The previous prime is 15420043. The next prime is 15420049. The reversal of 15420047 is 74002451.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15420047 - 2² = 15420043 is a prime.

Together with 15420049, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15420043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7710023 + 7710024.

It is an arithmetic number, because the mean of its divisors is an integer number (7710024).

Almost surely, 2^15420047 is an apocalyptic number.

15420047 is a deficient number, since it is larger than the sum of its proper divisors (1).

15420047 is an equidigital number, since it uses as much as digits as its factorization.

15420047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 15420047 is about 3926.8367676796. The cubic root of 15420047 is about 248.9021028790.

Adding to 15420047 its reverse (74002451), we get a palindrome (89422498).

The spelling of 15420047 in words is "fifteen million, four hundred twenty thousand, forty-seven".