1901397 has 4 divisors (see below), whose sum is σ = 2535200. Its totient is φ = 1267596.

The previous prime is 1901377. The next prime is 1901407. The reversal of 1901397 is 7931091.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1901397 - 2¹⁰ = 1900373 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1901357) 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, 316897 + ... + 316902.

It is an arithmetic number, because the mean of its divisors is an integer number (633800).

2^1901397 is an apocalyptic number.

It is an amenable number.

1901397 is a deficient number, since it is larger than the sum of its proper divisors (633803).

1901397 is an equidigital number, since it uses as much as digits as its factorization.

1901397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633802.

The product of its (nonzero) digits is 1701, while the sum is 30.

The square root of 1901397 is about 1378.9115272562. The cubic root of 1901397 is about 123.8865811679.

It can be divided in two parts, 19013 and 97, that added together give a triangular number (19110 = T₁₉₅).

The spelling of 1901397 in words is "one million, nine hundred one thousand, three hundred ninety-seven".