3781998 has 32 divisors (see below), whose sum is σ = 9169920. Its totient is φ = 1145880.

The previous prime is 3781993. The next prime is 3782011. The reversal of 3781998 is 8991873.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3781993) 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, 2590 + ... + 3777.

It is an arithmetic number, because the mean of its divisors is an integer number (286560).

Almost surely, 2^3781998 is an apocalyptic number.

3781998 is an abundant number, since it is smaller than the sum of its proper divisors (5387922).

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

3781998 is a wasteful number, since it uses less digits than its factorization.

3781998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6389 (or 6383 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 3781998 is about 1944.7359717967. The cubic root of 3781998 is about 155.8022642615.

The spelling of 3781998 in words is "three million, seven hundred eighty-one thousand, nine hundred ninety-eight".