1213664402 has 4 divisors (see below), whose sum is σ = 1820496606. Its totient is φ = 606832200.

The previous prime is 1213664399. The next prime is 1213664407. The reversal of 1213664402 is 2044663121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 720868801 + 492795601 = 26849^2 + 22199^2 .

It is not an unprimeable number, because it can be changed into a prime (1213664407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 303416099 + ... + 303416102.

Almost surely, 2^1213664402 is an apocalyptic number.

1213664402 is a deficient number, since it is larger than the sum of its proper divisors (606832204).

1213664402 is an equidigital number, since it uses as much as digits as its factorization.

1213664402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606832203.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 1213664402 is about 34837.6865190558. The cubic root of 1213664402 is about 1066.6768537873.

The spelling of 1213664402 in words is "one billion, two hundred thirteen million, six hundred sixty-four thousand, four hundred two".