1900640 has 48 divisors (see below), whose sum is σ = 5134752. Its totient is φ = 651264.

The previous prime is 1900621. The next prime is 1900667. The reversal of 1900640 is 460091.

It is a super-2 number, since 2×1900640² = 7224864819200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 272 + ... + 1968.

It is an arithmetic number, because the mean of its divisors is an integer number (106974).

2^1900640 is an apocalyptic number.

1900640 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 1900640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2567376).

1900640 is an abundant number, since it is smaller than the sum of its proper divisors (3234112).

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

1900640 is a wasteful number, since it uses less digits than its factorization.

1900640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1719 (or 1711 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 1900640 is about 1378.6370080627. The cubic root of 1900640 is about 123.8701380666.

The spelling of 1900640 in words is "one million, nine hundred thousand, six hundred forty".