1621199474 has 16 divisors (see below), whose sum is σ = 2519638488. Its totient is φ = 781708032.

The previous prime is 1621199473. The next prime is 1621199507. The reversal of 1621199474 is 4749911261.

It can be written as a sum of positive squares in 4 ways, for example, as 1571567449 + 49632025 = 39643^2 + 7045^2 .

It is not an unprimeable number, because it can be changed into a prime (1621199473) 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, 88577 + ... + 105300.

Almost surely, 2^1621199474 is an apocalyptic number.

1621199474 is a deficient number, since it is larger than the sum of its proper divisors (898439014).

1621199474 is a wasteful number, since it uses less digits than its factorization.

1621199474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194029.

The product of its digits is 108864, while the sum is 44.

The square root of 1621199474 is about 40264.1214234211. The cubic root of 1621199474 is about 1174.7500839236.

The spelling of 1621199474 in words is "one billion, six hundred twenty-one million, one hundred ninety-nine thousand, four hundred seventy-four".