1621406456 has 16 divisors (see below), whose sum is σ = 3042123000. Its totient is φ = 810173664.

The previous prime is 1621406453. The next prime is 1621406473. The reversal of 1621406456 is 6546041261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621406453) 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, 53030 + ... + 77813.

Almost surely, 2^1621406456 is an apocalyptic number.

It is an amenable number.

1621406456 is a deficient number, since it is larger than the sum of its proper divisors (1420716544).

1621406456 is a wasteful number, since it uses less digits than its factorization.

1621406456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132398 (or 132394 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 1621406456 is about 40266.6916445839. The cubic root of 1621406456 is about 1174.8000760803.

The spelling of 1621406456 in words is "one billion, six hundred twenty-one million, four hundred six thousand, four hundred fifty-six".