1243431402 has 64 divisors (see below), whose sum is σ = 2679091200. Its totient is φ = 383572800.

The previous prime is 1243431377. The next prime is 1243431407. The reversal of 1243431402 is 2041343421.

It is a super-2 number, since 2×1243431402² = 3092243302959371208, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1243431407) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 908923 + ... + 910289.

It is an arithmetic number, because the mean of its divisors is an integer number (41860800).

Almost surely, 2^1243431402 is an apocalyptic number.

1243431402 is an abundant number, since it is smaller than the sum of its proper divisors (1435659798).

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

1243431402 is a wasteful number, since it uses less digits than its factorization.

1243431402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1571.

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 1243431402 is about 35262.3226971792. The cubic root of 1243431402 is about 1075.3271481684.

Adding to 1243431402 its reverse (2041343421), we get a palindrome (3284774823).

The spelling of 1243431402 in words is "one billion, two hundred forty-three million, four hundred thirty-one thousand, four hundred two".