1901399 has 4 divisors (see below), whose sum is σ = 2013264. Its totient is φ = 1789536.

The previous prime is 1901377. The next prime is 1901407. The reversal of 1901399 is 9931091.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9931091 = 19 ⋅522689.

It is a cyclic number.

It is not a de Polignac number, because 1901399 - 2¹⁶ = 1835863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1901329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55907 + ... + 55940.

It is an arithmetic number, because the mean of its divisors is an integer number (503316).

2^1901399 is an apocalyptic number.

1901399 is a deficient number, since it is larger than the sum of its proper divisors (111865).

1901399 is a wasteful number, since it uses less digits than its factorization.

1901399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111864.

The product of its (nonzero) digits is 2187, while the sum is 32.

The square root of 1901399 is about 1378.9122524657. The cubic root of 1901399 is about 123.8866246049.

The spelling of 1901399 in words is "one million, nine hundred one thousand, three hundred ninety-nine".