785738621 has 16 divisors (see below), whose sum is σ = 831161088. Its totient is φ = 741998400.

The previous prime is 785738593. The next prime is 785738641. The reversal of 785738621 is 126837587.

It is a happy number.

It is not a de Polignac number, because 785738621 - 2²⁶ = 718629757 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (785738641) 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, 149366 + ... + 154536.

It is an arithmetic number, because the mean of its divisors is an integer number (51947568).

Almost surely, 2^785738621 is an apocalyptic number.

It is an amenable number.

785738621 is a deficient number, since it is larger than the sum of its proper divisors (45422467).

785738621 is a wasteful number, since it uses less digits than its factorization.

785738621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5332.

The product of its digits is 564480, while the sum is 47.

The square root of 785738621 is about 28031.0296100589. The cubic root of 785738621 is about 922.7683709362.

The spelling of 785738621 in words is "seven hundred eighty-five million, seven hundred thirty-eight thousand, six hundred twenty-one".