1900401 has 4 divisors (see below), whose sum is σ = 2533872. Its totient is φ = 1266932.

The previous prime is 1900397. The next prime is 1900429. The reversal of 1900401 is 1040091.

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 a cyclic number.

It is not a de Polignac number, because 1900401 - 2² = 1900397 is a prime.

It is a super-2 number, since 2×1900401² = 7223047921602, which contains 22 as substring.

It is an Ulam number.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (1900441) 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, 316731 + ... + 316736.

It is an arithmetic number, because the mean of its divisors is an integer number (633468).

2^1900401 is an apocalyptic number.

It is an amenable number.

1900401 is a deficient number, since it is larger than the sum of its proper divisors (633471).

1900401 is an equidigital number, since it uses as much as digits as its factorization.

1900401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633470.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1900401 is about 1378.5503255232. The cubic root of 1900401 is about 123.8649457447.

Adding to 1900401 its reverse (1040091), we get a palindrome (2940492).

The spelling of 1900401 in words is "one million, nine hundred thousand, four hundred one".