1206421940 has 24 divisors (see below), whose sum is σ = 2537740800. Its totient is φ = 481758368.

The previous prime is 1206421939. The next prime is 1206421943. The reversal of 1206421940 is 491246021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1206421943) 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, 38372 + ... + 62331.

It is an arithmetic number, because the mean of its divisors is an integer number (105739200).

Almost surely, 2^1206421940 is an apocalyptic number.

1206421940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1206421940 is an abundant number, since it is smaller than the sum of its proper divisors (1331318860).

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

1206421940 is a wasteful number, since it uses less digits than its factorization.

1206421940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101311 (or 101309 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 1206421940 is about 34733.5851878265. The cubic root of 1206421940 is about 1064.5508447118.

Adding to 1206421940 its reverse (491246021), we get a palindrome (1697667961).

The spelling of 1206421940 in words is "one billion, two hundred six million, four hundred twenty-one thousand, nine hundred forty".