1242472645 has 4 divisors (see below), whose sum is σ = 1490967180. Its totient is φ = 993978112.

The previous prime is 1242472633. The next prime is 1242472657. The reversal of 1242472645 is 5462742421.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1242472633) and next prime (1242472657).

It can be written as a sum of positive squares in 2 ways, for example, as 550887841 + 691584804 = 23471^2 + 26298^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242472645 - 2²⁵ = 1208918213 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124247260 + ... + 124247269.

It is an arithmetic number, because the mean of its divisors is an integer number (372741795).

Almost surely, 2^1242472645 is an apocalyptic number.

It is an amenable number.

1242472645 is a deficient number, since it is larger than the sum of its proper divisors (248494535).

1242472645 is an equidigital number, since it uses as much as digits as its factorization.

1242472645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248494534.

The product of its digits is 107520, while the sum is 37.

The square root of 1242472645 is about 35248.7254379502. The cubic root of 1242472645 is about 1075.0506974468.

The spelling of 1242472645 in words is "one billion, two hundred forty-two million, four hundred seventy-two thousand, six hundred forty-five".