16451940 has 24 divisors (see below), whose sum is σ = 46065600. Its totient is φ = 4387168.

The previous prime is 16451921. The next prime is 16451957. The reversal of 16451940 is 4915461.

It is a happy number.

16451940 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 16451898 and 16451907.

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, 137040 + ... + 137159.

It is an arithmetic number, because the mean of its divisors is an integer number (1919400).

Almost surely, 2^16451940 is an apocalyptic number.

16451940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16451940 is an abundant number, since it is smaller than the sum of its proper divisors (29613660).

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

16451940 is a wasteful number, since it uses less digits than its factorization.

16451940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274211 (or 274209 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 16451940 is about 4056.0991112151. The cubic root of 16451940 is about 254.3347519666.

It can be divided in two parts, 16451 and 940, that added together give a triangular number (17391 = T₁₈₆).

The spelling of 16451940 in words is "sixteen million, four hundred fifty-one thousand, nine hundred forty".