1019509940 has 24 divisors (see below), whose sum is σ = 2141627040. Its totient is φ = 407679008.

The previous prime is 1019509921. The next prime is 1019509973. The reversal of 1019509940 is 499059101.

It is a junction number, because it is equal to n+sod(n) for n = 1019509894 and 1019509903.

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, 87371 + ... + 98349.

It is an arithmetic number, because the mean of its divisors is an integer number (89234460).

Almost surely, 2^1019509940 is an apocalyptic number.

1019509940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1019509940 is an abundant number, since it is smaller than the sum of its proper divisors (1122117100).

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

1019509940 is a wasteful number, since it uses less digits than its factorization.

1019509940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15631 (or 15629 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 38.

The square root of 1019509940 is about 31929.7657366915. The cubic root of 1019509940 is about 1006.4614727793.

The spelling of 1019509940 in words is "one billion, nineteen million, five hundred nine thousand, nine hundred forty".