1901993678 has 16 divisors (see below), whose sum is σ = 3082949856. Its totient is φ = 874843680.

The previous prime is 1901993629. The next prime is 1901993683. The reversal of 1901993678 is 8763991091.

It is a congruent number.

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, 117218 + ... + 132453.

It is an arithmetic number, because the mean of its divisors is an integer number (192684366).

Almost surely, 2^1901993678 is an apocalyptic number.

1901993678 is a deficient number, since it is larger than the sum of its proper divisors (1180956178).

1901993678 is a wasteful number, since it uses less digits than its factorization.

1901993678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249979.

The product of its (nonzero) digits is 734832, while the sum is 53.

The square root of 1901993678 is about 43611.8524944768. The cubic root of 1901993678 is about 1238.9953877514.

The spelling of 1901993678 in words is "one billion, nine hundred one million, nine hundred ninety-three thousand, six hundred seventy-eight".