38999902 has 4 divisors (see below), whose sum is σ = 58499856. Its totient is φ = 19499950.

The previous prime is 38999861. The next prime is 38999903. The reversal of 38999902 is 20999983.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20999983 = 73 ⋅287671.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38999903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9749974 + ... + 9749977.

It is an arithmetic number, because the mean of its divisors is an integer number (14624964).

Almost surely, 2^38999902 is an apocalyptic number.

38999902 is a deficient number, since it is larger than the sum of its proper divisors (19499954).

38999902 is a wasteful number, since it uses less digits than its factorization.

38999902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19499953.

The product of its (nonzero) digits is 314928, while the sum is 49.

The square root of 38999902 is about 6244.9901521139. The cubic root of 38999902 is about 339.1208602510.

The spelling of 38999902 in words is "thirty-eight million, nine hundred ninety-nine thousand, nine hundred two".