1213638042 has 16 divisors (see below), whose sum is σ = 2478920832. Its totient is φ = 395938560.

The previous prime is 1213638037. The next prime is 1213638047. The reversal of 1213638042 is 2408363121.

It is an interprime number because it is at equal distance from previous prime (1213638037) and next prime (1213638047).

It is not an unprimeable number, because it can be changed into a prime (1213638047) 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, 2151559 + ... + 2152122.

It is an arithmetic number, because the mean of its divisors is an integer number (154932552).

Almost surely, 2^1213638042 is an apocalyptic number.

1213638042 is an abundant number, since it is smaller than the sum of its proper divisors (1265282790).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1213638042 is a wasteful number, since it uses less digits than its factorization.

1213638042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4303733.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 1213638042 is about 34837.3081910758. The cubic root of 1213638042 is about 1066.6691312226.

The spelling of 1213638042 in words is "one billion, two hundred thirteen million, six hundred thirty-eight thousand, forty-two".