1438423428 has 48 divisors (see below), whose sum is σ = 3649632896. Its totient is φ = 438289920.

The previous prime is 1438423423. The next prime is 1438423439. The reversal of 1438423428 is 8243248341.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (1438423423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28693 + ... + 60828.

Almost surely, 2^1438423428 is an apocalyptic number.

It is an amenable number.

1438423428 is an abundant number, since it is smaller than the sum of its proper divisors (2211209468).

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

1438423428 is a wasteful number, since it uses less digits than its factorization.

1438423428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89644 (or 89642 counting only the distinct ones).

The product of its digits is 147456, while the sum is 39.

The square root of 1438423428 is about 37926.5530730121. The cubic root of 1438423428 is about 1128.8309699841.

The spelling of 1438423428 in words is "one billion, four hundred thirty-eight million, four hundred twenty-three thousand, four hundred twenty-eight".