8220157 has 4 divisors (see below), whose sum is σ = 8967456. Its totient is φ = 7472860.

The previous prime is 8220143. The next prime is 8220169. The reversal of 8220157 is 7510228.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8220157 - 2¹¹ = 8218109 is a prime.

It is a super-2 number, since 2×8220157² = 135141962209298, which contains 22 as substring.

It is a Duffinian number.

8220157 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8220557) 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, 373633 + ... + 373654.

It is an arithmetic number, because the mean of its divisors is an integer number (2241864).

Almost surely, 2^8220157 is an apocalyptic number.

It is an amenable number.

8220157 is a deficient number, since it is larger than the sum of its proper divisors (747299).

8220157 is a wasteful number, since it uses less digits than its factorization.

8220157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 747298.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 8220157 is about 2867.0816172547. The cubic root of 8220157 is about 201.8180647908.

The spelling of 8220157 in words is "eight million, two hundred twenty thousand, one hundred fifty-seven".