1245429649 has 4 divisors (see below), whose sum is σ = 1247926000. Its totient is φ = 1242933300.

The previous prime is 1245429637. The next prime is 1245429677. The reversal of 1245429649 is 9469245421.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1245429649 - 2⁹ = 1245429137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1245429599 and 1245429608.

It is not an unprimeable number, because it can be changed into a prime (1245429629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1247427 + ... + 1248424.

It is an arithmetic number, because the mean of its divisors is an integer number (311981500).

Almost surely, 2^1245429649 is an apocalyptic number.

It is an amenable number.

1245429649 is a deficient number, since it is larger than the sum of its proper divisors (2496351).

1245429649 is an equidigital number, since it uses as much as digits as its factorization.

1245429649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2496350.

The product of its digits is 622080, while the sum is 46.

The square root of 1245429649 is about 35290.6453468904. The cubic root of 1245429649 is about 1075.9028719857.

The spelling of 1245429649 in words is "one billion, two hundred forty-five million, four hundred twenty-nine thousand, six hundred forty-nine".