1212157 has 6 divisors (see below), whose sum is σ = 1251834. Its totient is φ = 1172880.

The previous prime is 1212149. The next prime is 1212173. The reversal of 1212157 is 7512121.

It can be written as a sum of positive squares in 3 ways, for example, as 4356 + 1207801 = 66^2 + 1099^2 .

It is not a de Polignac number, because 1212157 - 2³ = 1212149 is a prime.

It is an Ulam number.

It is a Duffinian number.

1212157 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212187) 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, 6607 + ... + 6787.

It is an arithmetic number, because the mean of its divisors is an integer number (208639).

2^1212157 is an apocalyptic number.

It is an amenable number.

1212157 is a deficient number, since it is larger than the sum of its proper divisors (39677).

1212157 is an frugal number, since it uses more digits than its factorization.

1212157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399 (or 218 counting only the distinct ones).

The product of its digits is 140, while the sum is 19.

The square root of 1212157 is about 1100.9800179840. The cubic root of 1212157 is about 106.6235057585.

Adding to 1212157 its reverse (7512121), we get a palindrome (8724278).

It can be divided in two parts, 1212 and 157, that added together give a square (1369 = 37²).

The spelling of 1212157 in words is "one million, two hundred twelve thousand, one hundred fifty-seven".