1621199446 has 4 divisors (see below), whose sum is σ = 2431799172. Its totient is φ = 810599722.

The previous prime is 1621199429. The next prime is 1621199473. The reversal of 1621199446 is 6449911261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6449911261 = 45989 ⋅140249.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405299860 + ... + 405299863.

It is an arithmetic number, because the mean of its divisors is an integer number (607949793).

Almost surely, 2^1621199446 is an apocalyptic number.

1621199446 is a deficient number, since it is larger than the sum of its proper divisors (810599726).

1621199446 is an equidigital number, since it uses as much as digits as its factorization.

1621199446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810599725.

The product of its digits is 93312, while the sum is 43.

The square root of 1621199446 is about 40264.1210757170. The cubic root of 1621199446 is about 1174.7500771605.

The spelling of 1621199446 in words is "one billion, six hundred twenty-one million, one hundred ninety-nine thousand, four hundred forty-six".