1238499990 has 384 divisors, whose sum is σ = 4366656000. Its totient is φ = 246903552.

The previous prime is 1238499989. The next prime is 1238499991. The reversal of 1238499990 is 999948321.

It is an interprime number because it is at equal distance from previous prime (1238499989) and next prime (1238499991).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1238499991) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 3267621 + ... + 3267999.

It is an arithmetic number, because the mean of its divisors is an integer number (11371500).

Almost surely, 2^1238499990 is an apocalyptic number.

1238499990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1238499990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2183328000).

1238499990 is an abundant number, since it is smaller than the sum of its proper divisors (3128156010).

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

1238499990 is a wasteful number, since it uses less digits than its factorization.

1238499990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441 (or 428 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 54.

The square root of 1238499990 is about 35192.3285674591. The cubic root of 1238499990 is about 1073.9036928717.

The spelling of 1238499990 in words is "one billion, two hundred thirty-eight million, four hundred ninety-nine thousand, nine hundred ninety".