1921312470 has 128 divisors (see below), whose sum is σ = 5771243520. Its totient is φ = 397687680.

The previous prime is 1921312397. The next prime is 1921312493. The reversal of 1921312470 is 742131291.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 652261 + ... + 655199.

It is an arithmetic number, because the mean of its divisors is an integer number (45087840).

Almost surely, 2^1921312470 is an apocalyptic number.

1921312470 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1921312470, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2885621760).

1921312470 is an abundant number, since it is smaller than the sum of its proper divisors (3849931050).

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

1921312470 is a wasteful number, since it uses less digits than its factorization.

1921312470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3250.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 1921312470 is about 43832.7784882501. The cubic root of 1921312470 is about 1243.1761426979.

The spelling of 1921312470 in words is "one billion, nine hundred twenty-one million, three hundred twelve thousand, four hundred seventy".