38451720 has 32 divisors (see below), whose sum is σ = 115355520. Its totient is φ = 10253760.

The previous prime is 38451713. The next prime is 38451731. The reversal of 38451720 is 2715483.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 160096 + ... + 160335.

It is an arithmetic number, because the mean of its divisors is an integer number (3604860).

Almost surely, 2^38451720 is an apocalyptic number.

38451720 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

38451720 is an abundant number, since it is smaller than the sum of its proper divisors (76903800).

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

38451720 is a wasteful number, since it uses less digits than its factorization.

38451720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320445 (or 320441 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 38451720 is about 6200.9450892586. The cubic root of 38451720 is about 337.5244646189.

It can be divided in two parts, 3845 and 1720, that added together give a triangular number (5565 = T₁₀₅).

The spelling of 38451720 in words is "thirty-eight million, four hundred fifty-one thousand, seven hundred twenty".