1423561640 has 64 divisors (see below), whose sum is σ = 3411311760. Its totient is φ = 532787200.

The previous prime is 1423561627. The next prime is 1423561649. The reversal of 1423561640 is 461653241.

It can be written as a sum of positive squares in 8 ways, for example, as 1413308836 + 10252804 = 37594^2 + 3202^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1423561597 and 1423561606.

It is not an unprimeable number, because it can be changed into a prime (1423561649) 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, 111590 + ... + 123690.

Almost surely, 2^1423561640 is an apocalyptic number.

1423561640 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 1423561640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1705655880).

1423561640 is an abundant number, since it is smaller than the sum of its proper divisors (1987750120).

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

1423561640 is a wasteful number, since it uses less digits than its factorization.

1423561640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12302 (or 12298 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 1423561640 is about 37730.1158227748. The cubic root of 1423561640 is about 1124.9298102711.

The spelling of 1423561640 in words is "one billion, four hundred twenty-three million, five hundred sixty-one thousand, six hundred forty".