38711890 has 32 divisors (see below), whose sum is σ = 84322944. Its totient is φ = 12491520.

The previous prime is 38711887. The next prime is 38711891. The reversal of 38711890 is 9811783.

It is a super-2 number, since 2×38711890² = 2997220854744200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (38711891) 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, 15076 + ... + 17455.

It is an arithmetic number, because the mean of its divisors is an integer number (2635092).

Almost surely, 2^38711890 is an apocalyptic number.

38711890 is an abundant number, since it is smaller than the sum of its proper divisors (45611054).

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

38711890 is a wasteful number, since it uses less digits than its factorization.

38711890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32562.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 38711890 is about 6221.8879771336. The cubic root of 38711890 is about 338.2840008852.

It can be divided in two parts, 38711 and 890, that added together give a square (39601 = 199²).

The spelling of 38711890 in words is "thirty-eight million, seven hundred eleven thousand, eight hundred ninety".