1958440 has 32 divisors (see below), whose sum is σ = 4808160. Its totient is φ = 712000.

The previous prime is 1958431. The next prime is 1958449. The reversal of 1958440 is 448591.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1958431) and next prime (1958449).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1958449) 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, 1786 + ... + 2665.

It is an arithmetic number, because the mean of its divisors is an integer number (150255).

2^1958440 is an apocalyptic number.

1958440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1958440 is an abundant number, since it is smaller than the sum of its proper divisors (2849720).

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

1958440 is a wasteful number, since it uses less digits than its factorization.

1958440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4473 (or 4469 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 1958440 is about 1399.4427462387. The cubic root of 1958440 is about 125.1132839696.

It can be divided in two parts, 1 and 958440, that added together give a square (958441 = 979²).

The spelling of 1958440 in words is "one million, nine hundred fifty-eight thousand, four hundred forty".