1621049890 has 16 divisors (see below), whose sum is σ = 3044755008. Its totient is φ = 620227696.

The previous prime is 1621049887. The next prime is 1621049921. The reversal of 1621049890 is 989401261.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3523792 + ... + 3524251.

It is an arithmetic number, because the mean of its divisors is an integer number (190297188).

Almost surely, 2^1621049890 is an apocalyptic number.

1621049890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1621049890 is a deficient number, since it is larger than the sum of its proper divisors (1423705118).

1621049890 is a wasteful number, since it uses less digits than its factorization.

1621049890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7048073.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 1621049890 is about 40262.2638459389. The cubic root of 1621049890 is about 1174.7139523999.

The spelling of 1621049890 in words is "one billion, six hundred twenty-one million, forty-nine thousand, eight hundred ninety".