1913400 has 72 divisors (see below), whose sum is σ = 6431880. Its totient is φ = 509760.

The previous prime is 1913389. The next prime is 1913407. The reversal of 1913400 is 43191.

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×1913400² = 7322199120000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1913407) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1269 + ... + 2331.

2^1913400 is an apocalyptic number.

1913400 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 1913400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3215940).

1913400 is an abundant number, since it is smaller than the sum of its proper divisors (4518480).

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

1913400 is a wasteful number, since it uses less digits than its factorization.

1913400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1085 (or 1073 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 1913400 is about 1383.2570260078. The cubic root of 1913400 is about 124.1467219190.

Adding to 1913400 its reverse (43191), we get a palindrome (1956591).

The spelling of 1913400 in words is "one million, nine hundred thirteen thousand, four hundred".