1958638 has 16 divisors (see below), whose sum is σ = 3394224. Its totient is φ = 837760.

The previous prime is 1958633. The next prime is 1958639. The reversal of 1958638 is 8368591.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1958638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1958633) 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, 2245 + ... + 2992.

It is an arithmetic number, because the mean of its divisors is an integer number (212139).

2^1958638 is an apocalyptic number.

1958638 is a deficient number, since it is larger than the sum of its proper divisors (1435586).

1958638 is a wasteful number, since it uses less digits than its factorization.

1958638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5267.

The product of its digits is 51840, while the sum is 40.

The square root of 1958638 is about 1399.5134868946. The cubic root of 1958638 is about 125.1175001817.

The spelling of 1958638 in words is "one million, nine hundred fifty-eight thousand, six hundred thirty-eight".