1019401920 has 168 divisors, whose sum is σ = 3523366080. Its totient is φ = 270520320.

The previous prime is 1019401909. The next prime is 1019401921. The reversal of 1019401920 is 291049101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1019401921) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 687580 + ... + 689060.

Almost surely, 2^1019401920 is an apocalyptic number.

1019401920 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 1019401920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1761683040).

1019401920 is an abundant number, since it is smaller than the sum of its proper divisors (2503964160).

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

1019401920 is a wasteful number, since it uses less digits than its factorization.

1019401920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1743 (or 1730 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 1019401920 is about 31928.0741667893. The cubic root of 1019401920 is about 1006.4259256980.

The spelling of 1019401920 in words is "one billion, nineteen million, four hundred one thousand, nine hundred twenty".