1309723452 has 48 divisors (see below), whose sum is σ = 3595324320. Its totient is φ = 410893056.

The previous prime is 1309723451. The next prime is 1309723453. The reversal of 1309723452 is 2543279031.

1309723452 is a `hidden beast` number, since 1 + 309 + 7 + 2 + 345 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (1309723451) and next prime (1309723453).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1309723451) 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, 354843 + ... + 358514.

It is an arithmetic number, because the mean of its divisors is an integer number (74902590).

Almost surely, 2^1309723452 is an apocalyptic number.

1309723452 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1309723452 is an abundant number, since it is smaller than the sum of its proper divisors (2285600868).

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

1309723452 is a wasteful number, since it uses less digits than its factorization.

1309723452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 713387 (or 713379 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The square root of 1309723452 is about 36190.1015748782. The cubic root of 1309723452 is about 1094.1071799023.

The spelling of 1309723452 in words is "one billion, three hundred nine million, seven hundred twenty-three thousand, four hundred fifty-two".