1953721 has 8 divisors (see below), whose sum is σ = 2435904. Its totient is φ = 1522320.

The previous prime is 1953709. The next prime is 1953727. The reversal of 1953721 is 1273591.

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

It is a cyclic number.

It is not a de Polignac number, because 1953721 - 2⁷ = 1953593 is a prime.

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 1953721.

It is not an unprimeable number, because it can be changed into a prime (1953727) 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, 12610 + ... + 12763.

It is an arithmetic number, because the mean of its divisors is an integer number (304488).

2^1953721 is an apocalyptic number.

1953721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1953721 is a deficient number, since it is larger than the sum of its proper divisors (482183).

1953721 is a wasteful number, since it uses less digits than its factorization.

1953721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25391.

The product of its digits is 1890, while the sum is 28.

The square root of 1953721 is about 1397.7557011152. The cubic root of 1953721 is about 125.0127133736.

It can be divided in two parts, 195 and 3721, that added together give a triangular number (3916 = T₈₈).

The spelling of 1953721 in words is "one million, nine hundred fifty-three thousand, seven hundred twenty-one".