1220157 has 8 divisors (see below), whose sum is σ = 1807680. Its totient is φ = 813420.

The previous prime is 1220147. The next prime is 1220171. The reversal of 1220157 is 7510221.

It is not a de Polignac number, because 1220157 - 2⁷ = 1220029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22569 + ... + 22622.

It is an arithmetic number, because the mean of its divisors is an integer number (225960).

2^1220157 is an apocalyptic number.

It is an amenable number.

1220157 is a deficient number, since it is larger than the sum of its proper divisors (587523).

1220157 is an equidigital number, since it uses as much as digits as its factorization.

1220157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45200 (or 45194 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 18.

The square root of 1220157 is about 1104.6071699930. The cubic root of 1220157 is about 106.8575564021.

Adding to 1220157 its reverse (7510221), we get a palindrome (8730378).

Subtracting 1220157 from its reverse (7510221), we obtain a square (6290064 = 2508²).

The spelling of 1220157 in words is "one million, two hundred twenty thousand, one hundred fifty-seven".