1621783142 has 32 divisors (see below), whose sum is σ = 2807980032. Its totient is φ = 688129344.

The previous prime is 1621783129. The next prime is 1621783151. The reversal of 1621783142 is 2413871261.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1569458 + ... + 1570490.

It is an arithmetic number, because the mean of its divisors is an integer number (87749376).

Almost surely, 2^1621783142 is an apocalyptic number.

1621783142 is a deficient number, since it is larger than the sum of its proper divisors (1186196890).

1621783142 is a wasteful number, since it uses less digits than its factorization.

1621783142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2052.

The product of its digits is 16128, while the sum is 35.

The square root of 1621783142 is about 40271.3687624347. The cubic root of 1621783142 is about 1174.8910457597.

The spelling of 1621783142 in words is "one billion, six hundred twenty-one million, seven hundred eighty-three thousand, one hundred forty-two".