1019090920 has 32 divisors (see below), whose sum is σ = 2310469920. Its totient is φ = 404522560.

The previous prime is 1019090899. The next prime is 1019090921. The reversal of 1019090920 is 290909101.

It is not an unprimeable number, because it can be changed into a prime (1019090921) 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, 92002 + ... + 102481.

It is an arithmetic number, because the mean of its divisors is an integer number (72202185).

Almost surely, 2^1019090920 is an apocalyptic number.

1019090920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1019090920 is an abundant number, since it is smaller than the sum of its proper divisors (1291379000).

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

1019090920 is a wasteful number, since it uses less digits than its factorization.

1019090920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194625 (or 194621 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 31.

The square root of 1019090920 is about 31923.2034733358. The cubic root of 1019090920 is about 1006.3235681973.

The spelling of 1019090920 in words is "one billion, nineteen million, ninety thousand, nine hundred twenty".