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7924225 = 525632
BaseRepresentation
bin11110001110101000000001
3112220120222211
4132032220001
54012033400
6441502121
7124232461
oct36165001
915816884
107924225
114522651
1227a1941
131845aba
1410a3ba1
15a67dba
hex78ea01

7924225 has 9 divisors (see below), whose sum is σ = 9843523. Its totient is φ = 6328120.

The previous prime is 7924211. The next prime is 7924229. The reversal of 7924225 is 5224297.

The square root of 7924225 is 2815.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 2852721 + 5071504 = 1689^2 + 2252^2 .

It is not a de Polignac number, because 7924225 - 211 = 7922177 is a prime.

It is a d-powerful number, because it can be written as 78 + 95 + 2 + 43 + 25 + 221 + 55 .

It is a Duffinian number.

7924225 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7924229) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 13794 + ... + 14356.

Almost surely, 27924225 is an apocalyptic number.

7924225 is the 2815-th square number.

7924225 is the 1408-th centered octagonal number.

It is an amenable number.

7924225 is a deficient number, since it is larger than the sum of its proper divisors (1919298).

7924225 is an frugal number, since it uses more digits than its factorization.

7924225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1136 (or 568 counting only the distinct ones).

The product of its digits is 10080, while the sum is 31.

The cubic root of 7924225 is about 199.3665374107.

The spelling of 7924225 in words is "seven million, nine hundred twenty-four thousand, two hundred twenty-five".

Divisors: 1 5 25 563 2815 14075 316969 1584845 7924225