1243621402 has 8 divisors (see below), whose sum is σ = 1963612800. Its totient is φ = 589083804.

The previous prime is 1243621381. The next prime is 1243621409. The reversal of 1243621402 is 2041263421.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1243621409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16363402 + ... + 16363477.

It is an arithmetic number, because the mean of its divisors is an integer number (245451600).

Almost surely, 2^1243621402 is an apocalyptic number.

1243621402 is a deficient number, since it is larger than the sum of its proper divisors (719991398).

1243621402 is a wasteful number, since it uses less digits than its factorization.

1243621402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32726900.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 1243621402 is about 35265.0166879303. The cubic root of 1243621402 is about 1075.3819164363.

Adding to 1243621402 its reverse (2041263421), we get a palindrome (3284884823).

The spelling of 1243621402 in words is "one billion, two hundred forty-three million, six hundred twenty-one thousand, four hundred two".