1901172 has 48 divisors (see below), whose sum is σ = 5462912. Its totient is φ = 501120.

The previous prime is 1901147. The next prime is 1901177. The reversal of 1901172 is 2711091.

It is a super-2 number, since 2×1901172² = 7228909947168, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1901177) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 222 + ... + 1962.

2^1901172 is an apocalyptic number.

1901172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1901172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2731456).

1901172 is an abundant number, since it is smaller than the sum of its proper divisors (3561740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1901172 is a wasteful number, since it uses less digits than its factorization.

1901172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1768 (or 1766 counting only the distinct ones).

The product of its (nonzero) digits is 126, while the sum is 21.

The square root of 1901172 is about 1378.8299387524. The cubic root of 1901172 is about 123.8816943084.

The spelling of 1901172 in words is "one million, nine hundred one thousand, one hundred seventy-two".