1612388021 has 8 divisors (see below), whose sum is σ = 1686615360. Its totient is φ = 1538504352.

The previous prime is 1612388009. The next prime is 1612388077. The reversal of 1612388021 is 1208832161.

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

It is a cyclic number.

It is not a de Polignac number, because 1612388021 - 2⁶ = 1612387957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1612318021) 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, 76295 + ... + 95108.

It is an arithmetic number, because the mean of its divisors is an integer number (210826920).

Almost surely, 2^1612388021 is an apocalyptic number.

It is an amenable number.

1612388021 is a deficient number, since it is larger than the sum of its proper divisors (74227339).

1612388021 is a wasteful number, since it uses less digits than its factorization.

1612388021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171835.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 1612388021 is about 40154.5516847094. The cubic root of 1612388021 is about 1172.6179042891.

The spelling of 1612388021 in words is "one billion, six hundred twelve million, three hundred eighty-eight thousand, twenty-one".