1213197538 has 24 divisors (see below), whose sum is σ = 2194998912. Its totient is φ = 492574392.

The previous prime is 1213197533. The next prime is 1213197539. The reversal of 1213197538 is 8357913121.

It is a super-2 number, since 2×1213197538² = 2943696532418522888, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1213197538.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213197533) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 114970 + ... + 125077.

It is an arithmetic number, because the mean of its divisors is an integer number (91458288).

Almost surely, 2^1213197538 is an apocalyptic number.

1213197538 is a deficient number, since it is larger than the sum of its proper divisors (981801374).

1213197538 is a wasteful number, since it uses less digits than its factorization.

1213197538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240094 (or 240075 counting only the distinct ones).

The product of its digits is 45360, while the sum is 40.

The square root of 1213197538 is about 34830.9853148027. The cubic root of 1213197538 is about 1066.5400622958.

The spelling of 1213197538 in words is "one billion, two hundred thirteen million, one hundred ninety-seven thousand, five hundred thirty-eight".