38212840 has 32 divisors (see below), whose sum is σ = 87393960. Its totient is φ = 15033600.

The previous prime is 38212829. The next prime is 38212843. The reversal of 38212840 is 4821283.

It can be written as a sum of positive squares in 4 ways, for example, as 31832164 + 6380676 = 5642^2 + 2526^2 .

It is a super-2 number, since 2×38212840² = 2920442281731200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 38212799 and 38212808.

It is not an unprimeable number, because it can be changed into a prime (38212843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5391 + ... + 10270.

Almost surely, 2^38212840 is an apocalyptic number.

It is an amenable number.

38212840 is an abundant number, since it is smaller than the sum of its proper divisors (49181120).

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

38212840 is a wasteful number, since it uses less digits than its factorization.

38212840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15733 (or 15729 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 38212840 is about 6181.6535004803. The cubic root of 38212840 is about 336.8240591175.

It can be divided in two parts, 38 and 212840, that added together give a triangular number (212878 = T₆₅₂).

The spelling of 38212840 in words is "thirty-eight million, two hundred twelve thousand, eight hundred forty".