1958220 has 144 divisors (see below), whose sum is σ = 6918912. Its totient is φ = 443520.

The previous prime is 1958189. The next prime is 1958233. The reversal of 1958220 is 228591.

1958220 = T₁₃₁ + T₁₃₂ + ... + T₂₄₀.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 45519 + ... + 45561.

It is an arithmetic number, because the mean of its divisors is an integer number (48048).

2^1958220 is an apocalyptic number.

1958220 is a gapful number since it is divisible by the number (10) 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 1958220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3459456).

1958220 is an abundant number, since it is smaller than the sum of its proper divisors (4960692).

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

1958220 is a wasteful number, since it uses less digits than its factorization.

1958220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92 (or 87 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 1958220 is about 1399.3641413156. The cubic root of 1958220 is about 125.1085989561.

The spelling of 1958220 in words is "one million, nine hundred fifty-eight thousand, two hundred twenty".