1005139990 has 16 divisors (see below), whose sum is σ = 1811022048. Its totient is φ = 401662656.

The previous prime is 1005139987. The next prime is 1005139991. The reversal of 1005139990 is 999315001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1005139991) 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, 38322 + ... + 58981.

It is an arithmetic number, because the mean of its divisors is an integer number (113188878).

Almost surely, 2^1005139990 is an apocalyptic number.

1005139990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1005139990 is a deficient number, since it is larger than the sum of its proper divisors (805882058).

1005139990 is a wasteful number, since it uses less digits than its factorization.

1005139990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98343.

The product of its (nonzero) digits is 10935, while the sum is 37.

The square root of 1005139990 is about 31703.9428147352. The cubic root of 1005139990 is about 1001.7104028542.

The spelling of 1005139990 in words is "one billion, five million, one hundred thirty-nine thousand, nine hundred ninety".