3121423440 has 40 divisors (see below), whose sum is σ = 9676413408. Its totient is φ = 832379520.

The previous prime is 3121423423. The next prime is 3121423441. The reversal of 3121423440 is 443241213.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 3121423440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3121423441) 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, 6502726 + ... + 6503205.

Almost surely, 2^3121423440 is an apocalyptic number.

3121423440 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3121423440 is an abundant number, since it is smaller than the sum of its proper divisors (6554989968).

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

3121423440 is a wasteful number, since it uses less digits than its factorization.

3121423440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13005947 (or 13005941 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 3121423440 is about 55869.7005540570. The cubic root of 3121423440 is about 1461.4509001936.

Adding to 3121423440 its reverse (443241213), we get a palindrome (3564664653).

The spelling of 3121423440 in words is "three billion, one hundred twenty-one million, four hundred twenty-three thousand, four hundred forty".