1900421 has 8 divisors (see below), whose sum is σ = 2021760. Its totient is φ = 1782352.

The previous prime is 1900397. The next prime is 1900429. The reversal of 1900421 is 1240091.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1900421 is a prime.

It is a super-2 number, since 2×1900421² = 7223199954482, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1900421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1900429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 440 + ... + 1998.

It is an arithmetic number, because the mean of its divisors is an integer number (252720).

2^1900421 is an apocalyptic number.

It is an amenable number.

1900421 is a deficient number, since it is larger than the sum of its proper divisors (121339).

1900421 is a wasteful number, since it uses less digits than its factorization.

1900421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1635.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1900421 is about 1378.5575795011. The cubic root of 1900421 is about 123.8653802653.

The spelling of 1900421 in words is "one million, nine hundred thousand, four hundred twenty-one".