1398624 has 48 divisors (see below), whose sum is σ = 3891888. Its totient is φ = 438272.

The previous prime is 1398623. The next prime is 1398659. The reversal of 1398624 is 4268931.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×1398624² = 3912298186752, which contains 22 as substring.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1398623) 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, 1204 + ... + 2060.

It is an arithmetic number, because the mean of its divisors is an integer number (81081).

2^1398624 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1398624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1945944).

1398624 is an abundant number, since it is smaller than the sum of its proper divisors (2493264).

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

1398624 is a wasteful number, since it uses less digits than its factorization.

1398624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 887 (or 879 counting only the distinct ones).

The product of its digits is 10368, while the sum is 33.

The square root of 1398624 is about 1182.6343475479. The cubic root of 1398624 is about 111.8322318136.

The spelling of 1398624 in words is "one million, three hundred ninety-eight thousand, six hundred twenty-four".