38990890 has 16 divisors (see below), whose sum is σ = 70691040. Its totient is φ = 15483600.

The previous prime is 38990879. The next prime is 38990899. The reversal of 38990890 is 9809983.

It is a self number, because there is not a number n which added to its sum of digits gives 38990890.

It is not an unprimeable number, because it can be changed into a prime (38990899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12636 + ... + 15415.

It is an arithmetic number, because the mean of its divisors is an integer number (4418190).

Almost surely, 2^38990890 is an apocalyptic number.

38990890 is a deficient number, since it is larger than the sum of its proper divisors (31700150).

38990890 is a wasteful number, since it uses less digits than its factorization.

38990890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28197.

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 38990890 is about 6244.2685720587. The cubic root of 38990890 is about 339.0947371715.

The spelling of 38990890 in words is "thirty-eight million, nine hundred ninety thousand, eight hundred ninety".