1201215642 has 24 divisors (see below), whose sum is σ = 2640690528. Its totient is φ = 364004520.

The previous prime is 1201215637. The next prime is 1201215647. The reversal of 1201215642 is 2465121021.

It is an interprime number because it is at equal distance from previous prime (1201215637) and next prime (1201215647).

It is not an unprimeable number, because it can be changed into a prime (1201215647) 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, 826558 + ... + 828009.

It is an arithmetic number, because the mean of its divisors is an integer number (110028772).

Almost surely, 2^1201215642 is an apocalyptic number.

1201215642 is an abundant number, since it is smaller than the sum of its proper divisors (1439474886).

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

1201215642 is a wasteful number, since it uses less digits than its factorization.

1201215642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1654594 (or 1654583 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 1201215642 is about 34658.5579907762. The cubic root of 1201215642 is about 1063.0172848539.

Adding to 1201215642 its reverse (2465121021), we get a palindrome (3666336663).

The spelling of 1201215642 in words is "one billion, two hundred one million, two hundred fifteen thousand, six hundred forty-two".