1406121620 has 24 divisors (see below), whose sum is σ = 2993308584. Its totient is φ = 554743296.

The previous prime is 1406121617. The next prime is 1406121623. The reversal of 1406121620 is 261216041.

It is an interprime number because it is at equal distance from previous prime (1406121617) and next prime (1406121623).

It can be written as a sum of positive squares in 4 ways, for example, as 96550276 + 1309571344 = 9826^2 + 36188^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1406121623) 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, 480089 + ... + 483008.

It is an arithmetic number, because the mean of its divisors is an integer number (124721191).

Almost surely, 2^1406121620 is an apocalyptic number.

1406121620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1406121620 is an abundant number, since it is smaller than the sum of its proper divisors (1587186964).

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

1406121620 is a wasteful number, since it uses less digits than its factorization.

1406121620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 963179 (or 963177 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 1406121620 is about 37498.2882275978. The cubic root of 1406121620 is about 1120.3170924023.

Adding to 1406121620 its reverse (261216041), we get a palindrome (1667337661).

The spelling of 1406121620 in words is "one billion, four hundred six million, one hundred twenty-one thousand, six hundred twenty".