1210400040 has 64 divisors (see below), whose sum is σ = 3639556800. Its totient is φ = 322030592.

The previous prime is 1210400029. The next prime is 1210400063. The reversal of 1210400040 is 400040121.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1210399989 and 1210400025.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41776 + ... + 64544.

It is an arithmetic number, because the mean of its divisors is an integer number (56868075).

Almost surely, 2^1210400040 is an apocalyptic number.

1210400040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1210400040 is an abundant number, since it is smaller than the sum of its proper divisors (2429156760).

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

1210400040 is a wasteful number, since it uses less digits than its factorization.

1210400040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23226 (or 23222 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 1210400040 is about 34790.8039573678. The cubic root of 1210400040 is about 1065.7196573036.

Adding to 1210400040 its reverse (400040121), we get a palindrome (1610440161).

The spelling of 1210400040 in words is "one billion, two hundred ten million, four hundred thousand, forty".