1245747621 has 8 divisors (see below), whose sum is σ = 1661734144. Its totient is φ = 830129760.

The previous prime is 1245747599. The next prime is 1245747631. The reversal of 1245747621 is 1267475421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1245747621 - 2⁵ = 1245747589 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1245747621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245747631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84181 + ... + 97866.

It is an arithmetic number, because the mean of its divisors is an integer number (207716768).

Almost surely, 2^1245747621 is an apocalyptic number.

It is an amenable number.

1245747621 is a deficient number, since it is larger than the sum of its proper divisors (415986523).

1245747621 is a wasteful number, since it uses less digits than its factorization.

1245747621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184331.

The product of its digits is 94080, while the sum is 39.

The square root of 1245747621 is about 35295.1501059282. The cubic root of 1245747621 is about 1075.9944275058.

It can be divided in two parts, 124 and 5747621, that added together give a triangular number (5747745 = T₃₃₉₀).

The spelling of 1245747621 in words is "one billion, two hundred forty-five million, seven hundred forty-seven thousand, six hundred twenty-one".