1231608402 has 20 divisors (see below), whose sum is σ = 2759715486. Its totient is φ = 410536080.

The previous prime is 1231608383. The next prime is 1231608419. The reversal of 1231608402 is 2048061321.

1231608402 is a `hidden beast` number, since 12 + 3 + 1 + 608 + 40 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1169024481 + 62583921 = 34191^2 + 7911^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3801099 + ... + 3801422.

Almost surely, 2^1231608402 is an apocalyptic number.

1231608402 is an abundant number, since it is smaller than the sum of its proper divisors (1528107084).

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

1231608402 is an equidigital number, since it uses as much as digits as its factorization.

1231608402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7602535 (or 7602526 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 1231608402 is about 35094.2787644938. The cubic root of 1231608402 is about 1071.9080874871.

Adding to 1231608402 its reverse (2048061321), we get a palindrome (3279669723).

The spelling of 1231608402 in words is "one billion, two hundred thirty-one million, six hundred eight thousand, four hundred two".