3867457921 has 4 divisors (see below), whose sum is σ = 3868661844. Its totient is φ = 3866254000.

The previous prime is 3867457903. The next prime is 3867457939. The reversal of 3867457921 is 1297547683.

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 (3867457903) and next prime (3867457939).

It can be written as a sum of positive squares in 2 ways, for example, as 2858506225 + 1008951696 = 53465^2 + 31764^2 .

It is a cyclic number.

It is not a de Polignac number, because 3867457921 - 2⁹ = 3867457409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3867457901) 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, 597130 + ... + 603571.

It is an arithmetic number, because the mean of its divisors is an integer number (967165461).

Almost surely, 2^3867457921 is an apocalyptic number.

It is an amenable number.

3867457921 is a deficient number, since it is larger than the sum of its proper divisors (1203923).

3867457921 is a wasteful number, since it uses less digits than its factorization.

3867457921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1203922.

The product of its digits is 2540160, while the sum is 52.

The square root of 3867457921 is about 62188.8890478034. The cubic root of 3867457921 is about 1569.6706303264.

The spelling of 3867457921 in words is "three billion, eight hundred sixty-seven million, four hundred fifty-seven thousand, nine hundred twenty-one".