1309742925 has 12 divisors (see below), whose sum is σ = 2165441760. Its totient is φ = 698529520.

The previous prime is 1309742923. The next prime is 1309742927. The reversal of 1309742925 is 5292479031.

It is an interprime number because it is at equal distance from previous prime (1309742923) and next prime (1309742927).

It is not a de Polignac number, because 1309742925 - 2¹ = 1309742923 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1309742923) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8731545 + ... + 8731694.

It is an arithmetic number, because the mean of its divisors is an integer number (180453480).

Almost surely, 2^1309742925 is an apocalyptic number.

1309742925 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1309742925 is a deficient number, since it is larger than the sum of its proper divisors (855698835).

1309742925 is a wasteful number, since it uses less digits than its factorization.

1309742925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17463252 (or 17463247 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 42.

The square root of 1309742925 is about 36190.3706115315. The cubic root of 1309742925 is about 1094.1126022795.

The spelling of 1309742925 in words is "one billion, three hundred nine million, seven hundred forty-two thousand, nine hundred twenty-five".