1016401920 has 208 divisors, whose sum is σ = 3312047232. Its totient is φ = 266076160.

The previous prime is 1016401907. The next prime is 1016401927. The reversal of 1016401920 is 291046101.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (1016401927) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4362124 + ... + 4362356.

It is an arithmetic number, because the mean of its divisors is an integer number (15923304).

Almost surely, 2^1016401920 is an apocalyptic number.

1016401920 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 1016401920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1656023616).

1016401920 is an abundant number, since it is smaller than the sum of its proper divisors (2295645312).

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

1016401920 is an equidigital number, since it uses as much as digits as its factorization.

1016401920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336 (or 314 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 1016401920 is about 31881.0589535542. The cubic root of 1016401920 is about 1005.4376846577.

The spelling of 1016401920 in words is "one billion, sixteen million, four hundred one thousand, nine hundred twenty".