1611378140 has 48 divisors (see below), whose sum is σ = 3545278464. Its totient is φ = 614433600.

The previous prime is 1611378121. The next prime is 1611378143. The reversal of 1611378140 is 418731161.

It is a junction number, because it is equal to n+sod(n) for n = 1611378097 and 1611378106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1611378143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22145 + ... + 60935.

It is an arithmetic number, because the mean of its divisors is an integer number (73859968).

Almost surely, 2^1611378140 is an apocalyptic number.

1611378140 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 1611378140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1772639232).

1611378140 is an abundant number, since it is smaller than the sum of its proper divisors (1933900324).

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

1611378140 is a wasteful number, since it uses less digits than its factorization.

1611378140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38898 (or 38896 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 1611378140 is about 40141.9747894894. The cubic root of 1611378140 is about 1172.3730393548.

The spelling of 1611378140 in words is "one billion, six hundred eleven million, three hundred seventy-eight thousand, one hundred forty".