1263963990 has 32 divisors (see below), whose sum is σ = 3107504736. Its totient is φ = 328835840.

The previous prime is 1263963989. The next prime is 1263964003. The reversal of 1263963990 is 993693621.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 512577 + ... + 515036.

It is an arithmetic number, because the mean of its divisors is an integer number (97109523).

Almost surely, 2^1263963990 is an apocalyptic number.

1263963990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1263963990 is an abundant number, since it is smaller than the sum of its proper divisors (1843540746).

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

1263963990 is a wasteful number, since it uses less digits than its factorization.

1263963990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1027664.

The product of its (nonzero) digits is 472392, while the sum is 48.

The square root of 1263963990 is about 35552.2712354640. The cubic root of 1263963990 is about 1081.2137674161.

The spelling of 1263963990 in words is "one billion, two hundred sixty-three million, nine hundred sixty-three thousand, nine hundred ninety".