1990060040 has 32 divisors (see below), whose sum is σ = 4632039000. Its totient is φ = 768574464.

The previous prime is 1990060003. The next prime is 1990060043. The reversal of 1990060040 is 400600991.

It can be written as a sum of positive squares in 4 ways, for example, as 1948869316 + 41190724 = 44146^2 + 6418^2 .

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a junction number, because it is equal to n+sod(n) for n = 1990059985 and 1990060012.

It is not an unprimeable number, because it can be changed into a prime (1990060043) 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, 856625 + ... + 858944.

Almost surely, 2^1990060040 is an apocalyptic number.

1990060040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1990060040 is an abundant number, since it is smaller than the sum of its proper divisors (2641978960).

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

1990060040 is a wasteful number, since it uses less digits than its factorization.

1990060040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1715609 (or 1715605 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 1990060040 is about 44610.0889934104. The cubic root of 1990060040 is about 1257.8303216276.

The spelling of 1990060040 in words is "one billion, nine hundred ninety million, sixty thousand, forty".