1238764990 has 8 divisors (see below), whose sum is σ = 2229777000. Its totient is φ = 495505992.

The previous prime is 1238764987. The next prime is 1238764999. The reversal of 1238764990 is 994678321.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1238764999) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 61938240 + ... + 61938259.

It is an arithmetic number, because the mean of its divisors is an integer number (278722125).

Almost surely, 2^1238764990 is an apocalyptic number.

1238764990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1238764990 is a deficient number, since it is larger than the sum of its proper divisors (991012010).

1238764990 is a wasteful number, since it uses less digits than its factorization.

1238764990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123876506.

The product of its (nonzero) digits is 653184, while the sum is 49.

The square root of 1238764990 is about 35196.0933911706. The cubic root of 1238764990 is about 1073.9802812679.

It can be divided in two parts, 12387 and 64990, that added together give a palindrome (77377).

The spelling of 1238764990 in words is "one billion, two hundred thirty-eight million, seven hundred sixty-four thousand, nine hundred ninety".