1900440 has 48 divisors (see below), whose sum is σ = 6177600. Its totient is φ = 506688.

The previous prime is 1900433. The next prime is 1900441. The reversal of 1900440 is 440091.

It is a super-2 number, since 2×1900440² = 7223344387200, 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 zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1900441) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2280 + ... + 2999.

It is an arithmetic number, because the mean of its divisors is an integer number (128700).

2^1900440 is an apocalyptic number.

1900440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1900440 is an abundant number, since it is smaller than the sum of its proper divisors (4277160).

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

1900440 is a wasteful number, since it uses less digits than its factorization.

1900440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5296 (or 5289 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1900440 is about 1378.5644707448. The cubic root of 1900440 is about 123.8657930571.

It can be divided in two parts, 19004 and 40, that added together give a square (19044 = 138²).

The spelling of 1900440 in words is "one million, nine hundred thousand, four hundred forty".