1231964442 has 24 divisors (see below), whose sum is σ = 2675798580. Its totient is φ = 409648320.

The previous prime is 1231964429. The next prime is 1231964477. The reversal of 1231964442 is 2444691321.

1231964442 is a `hidden beast` number, since 1 + 2 + 3 + 1 + 9 + 644 + 4 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1216684161 + 15280281 = 34881^2 + 3909^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1231964397 and 1231964406.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 76309 + ... + 91032.

Almost surely, 2^1231964442 is an apocalyptic number.

1231964442 is an abundant number, since it is smaller than the sum of its proper divisors (1443834138).

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

1231964442 is a wasteful number, since it uses less digits than its factorization.

1231964442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167758 (or 167755 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The square root of 1231964442 is about 35099.3510196414. The cubic root of 1231964442 is about 1072.0113685259.

The spelling of 1231964442 in words is "one billion, two hundred thirty-one million, nine hundred sixty-four thousand, four hundred forty-two".