1620450918 has 24 divisors (see below), whose sum is σ = 3511755000. Its totient is φ = 540030624.

The previous prime is 1620450917. The next prime is 1620450919. The reversal of 1620450918 is 8190540261.

It is an interprime number because it is at equal distance from previous prime (1620450917) and next prime (1620450919).

It is a super-2 number, since 2×1620450918² = 5251722355294085448, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620450917) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 117658 + ... + 130706.

It is an arithmetic number, because the mean of its divisors is an integer number (146323125).

Almost surely, 2^1620450918 is an apocalyptic number.

1620450918 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1620450918 is an abundant number, since it is smaller than the sum of its proper divisors (1891304082).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1620450918 is a wasteful number, since it uses less digits than its factorization.

1620450918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19956 (or 19953 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 1620450918 is about 40254.8247791491. The cubic root of 1620450918 is about 1174.5692504079.

The spelling of 1620450918 in words is "one billion, six hundred twenty million, four hundred fifty thousand, nine hundred eighteen".