1621401244 has 6 divisors (see below), whose sum is σ = 2837452184. Its totient is φ = 810700620.

The previous prime is 1621401217. The next prime is 1621401259. The reversal of 1621401244 is 4421041261.

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, 202675152 + ... + 202675159.

Almost surely, 2^1621401244 is an apocalyptic number.

It is an amenable number.

1621401244 is a deficient number, since it is larger than the sum of its proper divisors (1216050940).

1621401244 is a wasteful number, since it uses less digits than its factorization.

1621401244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405350315 (or 405350313 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 1621401244 is about 40266.6269260290. The cubic root of 1621401244 is about 1174.7988172834.

The spelling of 1621401244 in words is "one billion, six hundred twenty-one million, four hundred one thousand, two hundred forty-four".