1243509402 has 8 divisors (see below), whose sum is σ = 2487018816. Its totient is φ = 414503132.

The previous prime is 1243509391. The next prime is 1243509413. The reversal of 1243509402 is 2049053421.

It is an interprime number because it is at equal distance from previous prime (1243509391) and next prime (1243509413).

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

1243509402 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 1243509402.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103625778 + ... + 103625789.

It is an arithmetic number, because the mean of its divisors is an integer number (310877352).

Almost surely, 2^1243509402 is an apocalyptic number.

1243509402 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1243509402 is a wasteful number, since it uses less digits than its factorization.

1243509402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207251572.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 1243509402 is about 35263.4286761795. The cubic root of 1243509402 is about 1075.3496326587.

The spelling of 1243509402 in words is "one billion, two hundred forty-three million, five hundred nine thousand, four hundred two".