1901939387 has 4 divisors (see below), whose sum is σ = 2002041480. Its totient is φ = 1801837296.

The previous prime is 1901939359. The next prime is 1901939411. The reversal of 1901939387 is 7839391091.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1901939387 - 2⁶ = 1901939323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1901939327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50051018 + ... + 50051055.

It is an arithmetic number, because the mean of its divisors is an integer number (500510370).

Almost surely, 2^1901939387 is an apocalyptic number.

1901939387 is a deficient number, since it is larger than the sum of its proper divisors (100102093).

1901939387 is a wasteful number, since it uses less digits than its factorization.

1901939387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100102092.

The product of its (nonzero) digits is 367416, while the sum is 50.

The square root of 1901939387 is about 43611.2300560303. The cubic root of 1901939387 is about 1238.9835989042.

The spelling of 1901939387 in words is "one billion, nine hundred one million, nine hundred thirty-nine thousand, three hundred eighty-seven".