1438686820 has 24 divisors (see below), whose sum is σ = 3033289728. Its totient is φ = 573180000.

The previous prime is 1438686811. The next prime is 1438686841. The reversal of 1438686820 is 286868341.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138276 + ... + 148315.

It is an arithmetic number, because the mean of its divisors is an integer number (126387072).

Almost surely, 2^1438686820 is an apocalyptic number.

1438686820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1438686820 is an abundant number, since it is smaller than the sum of its proper divisors (1594602908).

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

1438686820 is a wasteful number, since it uses less digits than its factorization.

1438686820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286851 (or 286849 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 46.

The square root of 1438686820 is about 37930.0253097727. The cubic root of 1438686820 is about 1128.8998664566.

The spelling of 1438686820 in words is "one billion, four hundred thirty-eight million, six hundred eighty-six thousand, eight hundred twenty".