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15420949 is a prime number
BaseRepresentation
bin111010110100…
…111000010101
31002000110120021
4322310320111
512421432244
61310305141
7245035015
oct72647025
932013507
1015420949
118782a95
1251b81b1
13326c12b
142095c45
151549284
hexeb4e15

15420949 has 2 divisors, whose sum is σ = 15420950. Its totient is φ = 15420948.

The previous prime is 15420943. The next prime is 15420967. The reversal of 15420949 is 94902451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15350724 + 70225 = 3918^2 + 265^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-15420949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15420943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7710474 + 7710475.

It is an arithmetic number, because the mean of its divisors is an integer number (7710475).

Almost surely, 215420949 is an apocalyptic number.

It is an amenable number.

15420949 is a deficient number, since it is larger than the sum of its proper divisors (1).

15420949 is an equidigital number, since it uses as much as digits as its factorization.

15420949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 15420949 is about 3926.9516167124. The cubic root of 15420949 is about 248.9069559840.

The spelling of 15420949 in words is "fifteen million, four hundred twenty thousand, nine hundred forty-nine".