7242157 has 6 divisors (see below), whose sum is σ = 7842282. Its totient is φ = 6684912.

The previous prime is 7242149. The next prime is 7242181. The reversal of 7242157 is 7512427.

It can be written as a sum of positive squares in 3 ways, for example, as 1022121 + 6220036 = 1011^2 + 2494^2 .

It is not a de Polignac number, because 7242157 - 2³ = 7242149 is a prime.

It is a Duffinian number.

7242157 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7242457) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21258 + ... + 21595.

It is an arithmetic number, because the mean of its divisors is an integer number (1307047).

Almost surely, 2^7242157 is an apocalyptic number.

It is an amenable number.

7242157 is a deficient number, since it is larger than the sum of its proper divisors (600125).

7242157 is a wasteful number, since it uses less digits than its factorization.

7242157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42879 (or 42866 counting only the distinct ones).

The product of its digits is 3920, while the sum is 28.

The square root of 7242157 is about 2691.1256009336. The cubic root of 7242157 is about 193.4740153887.

The spelling of 7242157 in words is "seven million, two hundred forty-two thousand, one hundred fifty-seven".